cbs_av1.c 37.8 KB
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/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/avassert.h"
#include "libavutil/pixfmt.h"

#include "cbs.h"
#include "cbs_internal.h"
#include "cbs_av1.h"
#include "internal.h"


static int cbs_av1_read_uvlc(CodedBitstreamContext *ctx, GetBitContext *gbc,
                             const char *name, uint32_t *write_to,
                             uint32_t range_min, uint32_t range_max)
{
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    uint32_t zeroes, bits_value, value;
    int position;
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    if (ctx->trace_enable)
        position = get_bits_count(gbc);

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    zeroes = 0;
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    while (1) {
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        if (get_bits_left(gbc) < 1) {
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            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid uvlc code at "
                   "%s: bitstream ended.\n", name);
            return AVERROR_INVALIDDATA;
        }

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        if (get_bits1(gbc))
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            break;
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        ++zeroes;
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    }

    if (zeroes >= 32) {
        value = MAX_UINT_BITS(32);
    } else {
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        if (get_bits_left(gbc) < zeroes) {
            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid uvlc code at "
                   "%s: bitstream ended.\n", name);
            return AVERROR_INVALIDDATA;
        }
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        bits_value = get_bits_long(gbc, zeroes);
        value = bits_value + (UINT32_C(1) << zeroes) - 1;
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    }

    if (ctx->trace_enable) {
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        char bits[65];
        int i, j, k;

        if (zeroes >= 32) {
            while (zeroes > 32) {
                k = FFMIN(zeroes - 32, 32);
                for (i = 0; i < k; i++)
                    bits[i] = '0';
                bits[i] = 0;
                ff_cbs_trace_syntax_element(ctx, position, name,
                                            NULL, bits, 0);
                zeroes -= k;
                position += k;
            }
        }

        for (i = 0; i < zeroes; i++)
            bits[i] = '0';
        bits[i++] = '1';

        if (zeroes < 32) {
            for (j = 0; j < zeroes; j++)
                bits[i++] = (bits_value >> (zeroes - j - 1) & 1) ? '1' : '0';
        }

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        bits[i] = 0;
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        ff_cbs_trace_syntax_element(ctx, position, name,
                                    NULL, bits, value);
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    }

    if (value < range_min || value > range_max) {
        av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
               "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
               name, value, range_min, range_max);
        return AVERROR_INVALIDDATA;
    }

    *write_to = value;
    return 0;
}

static int cbs_av1_write_uvlc(CodedBitstreamContext *ctx, PutBitContext *pbc,
                              const char *name, uint32_t value,
                              uint32_t range_min, uint32_t range_max)
{
    uint32_t v;
    int position, zeroes;

    if (value < range_min || value > range_max) {
        av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
               "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
               name, value, range_min, range_max);
        return AVERROR_INVALIDDATA;
    }

    if (ctx->trace_enable)
        position = put_bits_count(pbc);

    if (value == 0) {
        zeroes = 0;
        put_bits(pbc, 1, 1);
    } else {
        zeroes = av_log2(value + 1);
        v = value - (1 << zeroes) + 1;
        put_bits(pbc, zeroes + 1, 1);
        put_bits(pbc, zeroes, v);
    }

    if (ctx->trace_enable) {
        char bits[65];
        int i, j;
        i = 0;
        for (j = 0; j < zeroes; j++)
            bits[i++] = '0';
        bits[i++] = '1';
        for (j = 0; j < zeroes; j++)
            bits[i++] = (v >> (zeroes - j - 1) & 1) ? '1' : '0';
        bits[i++] = 0;
        ff_cbs_trace_syntax_element(ctx, position, name, NULL,
                                    bits, value);
    }

    return 0;
}

static int cbs_av1_read_leb128(CodedBitstreamContext *ctx, GetBitContext *gbc,
                               const char *name, uint64_t *write_to)
{
    uint64_t value;
    int position, err, i;

    if (ctx->trace_enable)
        position = get_bits_count(gbc);

    value = 0;
    for (i = 0; i < 8; i++) {
        int subscript[2] = { 1, i };
        uint32_t byte;
        err = ff_cbs_read_unsigned(ctx, gbc, 8, "leb128_byte[i]", subscript,
                                   &byte, 0x00, 0xff);
        if (err < 0)
            return err;

        value |= (uint64_t)(byte & 0x7f) << (i * 7);
        if (!(byte & 0x80))
            break;
    }

    if (ctx->trace_enable)
        ff_cbs_trace_syntax_element(ctx, position, name, NULL, "", value);

    *write_to = value;
    return 0;
}

static int cbs_av1_write_leb128(CodedBitstreamContext *ctx, PutBitContext *pbc,
                                const char *name, uint64_t value)
{
    int position, err, len, i;
    uint8_t byte;

    len = (av_log2(value) + 7) / 7;

    if (ctx->trace_enable)
        position = put_bits_count(pbc);

    for (i = 0; i < len; i++) {
        int subscript[2] = { 1, i };

        byte = value >> (7 * i) & 0x7f;
        if (i < len - 1)
            byte |= 0x80;

        err = ff_cbs_write_unsigned(ctx, pbc, 8, "leb128_byte[i]", subscript,
                                    byte, 0x00, 0xff);
        if (err < 0)
            return err;
    }

    if (ctx->trace_enable)
        ff_cbs_trace_syntax_element(ctx, position, name, NULL, "", value);

    return 0;
}

static int cbs_av1_read_ns(CodedBitstreamContext *ctx, GetBitContext *gbc,
                           uint32_t n, const char *name,
                           const int *subscripts, uint32_t *write_to)
{
    uint32_t w, m, v, extra_bit, value;
    int position;

    av_assert0(n > 0);

    if (ctx->trace_enable)
        position = get_bits_count(gbc);

    w = av_log2(n) + 1;
    m = (1 << w) - n;

    if (get_bits_left(gbc) < w) {
        av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid non-symmetric value at "
               "%s: bitstream ended.\n", name);
        return AVERROR_INVALIDDATA;
    }

    if (w - 1 > 0)
        v = get_bits(gbc, w - 1);
    else
        v = 0;

    if (v < m) {
        value = v;
    } else {
        extra_bit = get_bits1(gbc);
        value = (v << 1) - m + extra_bit;
    }

    if (ctx->trace_enable) {
        char bits[33];
        int i;
        for (i = 0; i < w - 1; i++)
            bits[i] = (v >> i & 1) ? '1' : '0';
        if (v >= m)
            bits[i++] = extra_bit ? '1' : '0';
        bits[i] = 0;

        ff_cbs_trace_syntax_element(ctx, position,
                                    name, subscripts, bits, value);
    }

    *write_to = value;
    return 0;
}

static int cbs_av1_write_ns(CodedBitstreamContext *ctx, PutBitContext *pbc,
                            uint32_t n, const char *name,
                            const int *subscripts, uint32_t value)
{
    uint32_t w, m, v, extra_bit;
    int position;

    if (value > n) {
        av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
               "%"PRIu32", but must be in [0,%"PRIu32"].\n",
               name, value, n);
        return AVERROR_INVALIDDATA;
    }

    if (ctx->trace_enable)
        position = put_bits_count(pbc);

    w = av_log2(n) + 1;
    m = (1 << w) - n;

    if (put_bits_left(pbc) < w)
        return AVERROR(ENOSPC);

    if (value < m) {
        v = value;
        put_bits(pbc, w - 1, v);
    } else {
        v = m + ((value - m) >> 1);
        extra_bit = (value - m) & 1;
        put_bits(pbc, w - 1, v);
        put_bits(pbc, 1, extra_bit);
    }

    if (ctx->trace_enable) {
        char bits[33];
        int i;
        for (i = 0; i < w - 1; i++)
            bits[i] = (v >> i & 1) ? '1' : '0';
        if (value >= m)
            bits[i++] = extra_bit ? '1' : '0';
        bits[i] = 0;

        ff_cbs_trace_syntax_element(ctx, position,
                                    name, subscripts, bits, value);
    }

    return 0;
}

static int cbs_av1_read_increment(CodedBitstreamContext *ctx, GetBitContext *gbc,
                                  uint32_t range_min, uint32_t range_max,
                                  const char *name, uint32_t *write_to)
{
    uint32_t value;
    int position, i;
    char bits[33];

    av_assert0(range_min <= range_max && range_max - range_min < sizeof(bits) - 1);
    if (ctx->trace_enable)
        position = get_bits_count(gbc);

    for (i = 0, value = range_min; value < range_max;) {
        if (get_bits_left(gbc) < 1) {
            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid increment value at "
                   "%s: bitstream ended.\n", name);
            return AVERROR_INVALIDDATA;
        }
        if (get_bits1(gbc)) {
            bits[i++] = '1';
            ++value;
        } else {
            bits[i++] = '0';
            break;
        }
    }

    if (ctx->trace_enable) {
        bits[i] = 0;
        ff_cbs_trace_syntax_element(ctx, position,
                                    name, NULL, bits, value);
    }

    *write_to = value;
    return 0;
}

static int cbs_av1_write_increment(CodedBitstreamContext *ctx, PutBitContext *pbc,
                                   uint32_t range_min, uint32_t range_max,
                                   const char *name, uint32_t value)
{
    int len;

    av_assert0(range_min <= range_max && range_max - range_min < 32);
    if (value < range_min || value > range_max) {
        av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
               "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
               name, value, range_min, range_max);
        return AVERROR_INVALIDDATA;
    }

    if (value == range_max)
        len = range_max - range_min;
    else
        len = value - range_min + 1;
    if (put_bits_left(pbc) < len)
        return AVERROR(ENOSPC);

    if (ctx->trace_enable) {
        char bits[33];
        int i;
        for (i = 0; i < len; i++) {
            if (range_min + i == value)
                bits[i] = '0';
            else
                bits[i] = '1';
        }
        bits[i] = 0;
        ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
                                    name, NULL, bits, value);
    }

    if (len > 0)
        put_bits(pbc, len, (1 << len) - 1 - (value != range_max));

    return 0;
}

static int cbs_av1_read_subexp(CodedBitstreamContext *ctx, GetBitContext *gbc,
                               uint32_t range_max, const char *name,
                               const int *subscripts, uint32_t *write_to)
{
    uint32_t value;
    int position, err;
    uint32_t max_len, len, range_offset, range_bits;

    if (ctx->trace_enable)
        position = get_bits_count(gbc);

    av_assert0(range_max > 0);
    max_len = av_log2(range_max - 1) - 3;

    err = cbs_av1_read_increment(ctx, gbc, 0, max_len,
                                 "subexp_more_bits", &len);
    if (err < 0)
        return err;

    if (len) {
        range_bits   = 2 + len;
        range_offset = 1 << range_bits;
    } else {
        range_bits   = 3;
        range_offset = 0;
    }

    if (len < max_len) {
        err = ff_cbs_read_unsigned(ctx, gbc, range_bits,
                                   "subexp_bits", NULL, &value,
                                   0, MAX_UINT_BITS(range_bits));
        if (err < 0)
            return err;

    } else {
        err = cbs_av1_read_ns(ctx, gbc, range_max - range_offset,
                              "subexp_final_bits", NULL, &value);
        if (err < 0)
            return err;
    }
    value += range_offset;

    if (ctx->trace_enable)
        ff_cbs_trace_syntax_element(ctx, position,
                                    name, subscripts, "", value);

    *write_to = value;
    return err;
}

static int cbs_av1_write_subexp(CodedBitstreamContext *ctx, PutBitContext *pbc,
                                uint32_t range_max, const char *name,
                                const int *subscripts, uint32_t value)
{
    int position, err;
    uint32_t max_len, len, range_offset, range_bits;

    if (value > range_max) {
        av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
               "%"PRIu32", but must be in [0,%"PRIu32"].\n",
               name, value, range_max);
        return AVERROR_INVALIDDATA;
    }

    if (ctx->trace_enable)
        position = put_bits_count(pbc);

    av_assert0(range_max > 0);
    max_len = av_log2(range_max - 1) - 3;

    if (value < 8) {
        range_bits   = 3;
        range_offset = 0;
        len = 0;
    } else {
        range_bits = av_log2(value);
        len = range_bits - 2;
        if (len > max_len) {
            // The top bin is combined with the one below it.
            av_assert0(len == max_len + 1);
            --range_bits;
            len = max_len;
        }
        range_offset = 1 << range_bits;
    }

    err = cbs_av1_write_increment(ctx, pbc, 0, max_len,
                                  "subexp_more_bits", len);
    if (err < 0)
        return err;

    if (len < max_len) {
        err = ff_cbs_write_unsigned(ctx, pbc, range_bits,
                                    "subexp_bits", NULL,
                                    value - range_offset,
                                    0, MAX_UINT_BITS(range_bits));
        if (err < 0)
            return err;

    } else {
        err = cbs_av1_write_ns(ctx, pbc, range_max - range_offset,
                               "subexp_final_bits", NULL,
                               value - range_offset);
        if (err < 0)
            return err;
    }

    if (ctx->trace_enable)
        ff_cbs_trace_syntax_element(ctx, position,
                                    name, subscripts, "", value);

    return err;
}


static int cbs_av1_tile_log2(int blksize, int target)
{
    int k;
    for (k = 0; (blksize << k) < target; k++);
    return k;
}

static int cbs_av1_get_relative_dist(const AV1RawSequenceHeader *seq,
                                     unsigned int a, unsigned int b)
{
    unsigned int diff, m;
    if (!seq->enable_order_hint)
        return 0;
    diff = a - b;
    m = 1 << seq->order_hint_bits_minus_1;
    diff = (diff & (m - 1)) - (diff & m);
    return diff;
}

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static size_t cbs_av1_get_payload_bytes_left(GetBitContext *gbc)
{
    GetBitContext tmp = *gbc;
    size_t size = 0;
    for (int i = 0; get_bits_left(&tmp) >= 8; i++) {
        if (get_bits(&tmp, 8))
            size = i;
    }
    return size;
}

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#define HEADER(name) do { \
        ff_cbs_trace_header(ctx, name); \
    } while (0)

#define CHECK(call) do { \
        err = (call); \
        if (err < 0) \
            return err; \
    } while (0)

#define FUNC_NAME(rw, codec, name) cbs_ ## codec ## _ ## rw ## _ ## name
#define FUNC_AV1(rw, name) FUNC_NAME(rw, av1, name)
#define FUNC(name) FUNC_AV1(READWRITE, name)

#define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)

#define fb(width, name) \
        xf(width, name, current->name, 0, MAX_UINT_BITS(width), 0)
#define fc(width, name, range_min, range_max) \
        xf(width, name, current->name, range_min, range_max, 0)
#define flag(name) fb(1, name)
#define su(width, name) \
        xsu(width, name, current->name, 0)

#define fbs(width, name, subs, ...) \
        xf(width, name, current->name, 0, MAX_UINT_BITS(width), subs, __VA_ARGS__)
#define fcs(width, name, range_min, range_max, subs, ...) \
        xf(width, name, current->name, range_min, range_max, subs, __VA_ARGS__)
#define flags(name, subs, ...) \
        xf(1, name, current->name, 0, 1, subs, __VA_ARGS__)
#define sus(width, name, subs, ...) \
        xsu(width, name, current->name, subs, __VA_ARGS__)

#define fixed(width, name, value) do { \
        av_unused uint32_t fixed_value = value; \
        xf(width, name, fixed_value, value, value, 0); \
    } while (0)


#define READ
#define READWRITE read
#define RWContext GetBitContext

#define xf(width, name, var, range_min, range_max, subs, ...) do { \
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        uint32_t value; \
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        CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
                                   SUBSCRIPTS(subs, __VA_ARGS__), \
                                   &value, range_min, range_max)); \
        var = value; \
    } while (0)

#define xsu(width, name, var, subs, ...) do { \
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        int32_t value; \
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        CHECK(ff_cbs_read_signed(ctx, rw, width, #name, \
                                 SUBSCRIPTS(subs, __VA_ARGS__), &value, \
                                 MIN_INT_BITS(width), \
                                 MAX_INT_BITS(width))); \
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        var = value; \
    } while (0)

#define uvlc(name, range_min, range_max) do { \
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        uint32_t value; \
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        CHECK(cbs_av1_read_uvlc(ctx, rw, #name, \
                                &value, range_min, range_max)); \
        current->name = value; \
    } while (0)

#define ns(max_value, name, subs, ...) do { \
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        uint32_t value; \
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        CHECK(cbs_av1_read_ns(ctx, rw, max_value, #name, \
                              SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
        current->name = value; \
    } while (0)

#define increment(name, min, max) do { \
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        uint32_t value; \
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        CHECK(cbs_av1_read_increment(ctx, rw, min, max, #name, &value)); \
        current->name = value; \
    } while (0)

#define subexp(name, max, subs, ...) do { \
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        uint32_t value; \
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        CHECK(cbs_av1_read_subexp(ctx, rw, max, #name, \
                                  SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
        current->name = value; \
    } while (0)

#define delta_q(name) do { \
        uint8_t delta_coded; \
        int8_t delta_q; \
        xf(1, name.delta_coded, delta_coded, 0, 1, 0); \
        if (delta_coded) \
            xsu(1 + 6, name.delta_q, delta_q, 0); \
        else \
            delta_q = 0; \
        current->name = delta_q; \
    } while (0)

#define leb128(name) do { \
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        uint64_t value; \
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        CHECK(cbs_av1_read_leb128(ctx, rw, #name, &value)); \
        current->name = value; \
    } while (0)

#define infer(name, value) do { \
        current->name = value; \
    } while (0)

#define byte_alignment(rw) (get_bits_count(rw) % 8)

#include "cbs_av1_syntax_template.c"

#undef READ
#undef READWRITE
#undef RWContext
#undef xf
#undef xsu
#undef uvlc
#undef ns
#undef increment
#undef subexp
#undef delta_q
#undef leb128
#undef infer
#undef byte_alignment


#define WRITE
#define READWRITE write
#define RWContext PutBitContext

#define xf(width, name, var, range_min, range_max, subs, ...) do { \
        CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
                                    SUBSCRIPTS(subs, __VA_ARGS__), \
                                    var, range_min, range_max)); \
    } while (0)

#define xsu(width, name, var, subs, ...) do { \
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        CHECK(ff_cbs_write_signed(ctx, rw, width, #name, \
                                  SUBSCRIPTS(subs, __VA_ARGS__), var, \
                                  MIN_INT_BITS(width), \
                                  MAX_INT_BITS(width))); \
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    } while (0)

#define uvlc(name, range_min, range_max) do { \
        CHECK(cbs_av1_write_uvlc(ctx, rw, #name, current->name, \
                                 range_min, range_max)); \
    } while (0)

#define ns(max_value, name, subs, ...) do { \
        CHECK(cbs_av1_write_ns(ctx, rw, max_value, #name, \
                               SUBSCRIPTS(subs, __VA_ARGS__), \
                               current->name)); \
    } while (0)

#define increment(name, min, max) do { \
        CHECK(cbs_av1_write_increment(ctx, rw, min, max, #name, \
                                      current->name)); \
    } while (0)

#define subexp(name, max, subs, ...) do { \
        CHECK(cbs_av1_write_subexp(ctx, rw, max, #name, \
                                   SUBSCRIPTS(subs, __VA_ARGS__), \
                                   current->name)); \
    } while (0)

#define delta_q(name) do { \
        xf(1, name.delta_coded, current->name != 0, 0, 1, 0); \
        if (current->name) \
            xsu(1 + 6, name.delta_q, current->name, 0); \
    } while (0)

#define leb128(name) do { \
        CHECK(cbs_av1_write_leb128(ctx, rw, #name, current->name)); \
    } while (0)

#define infer(name, value) do { \
        if (current->name != (value)) { \
            av_log(ctx->log_ctx, AV_LOG_WARNING, "Warning: " \
                   "%s does not match inferred value: " \
                   "%"PRId64", but should be %"PRId64".\n", \
                   #name, (int64_t)current->name, (int64_t)(value)); \
        } \
    } while (0)

#define byte_alignment(rw) (put_bits_count(rw) % 8)

#include "cbs_av1_syntax_template.c"

722
#undef WRITE
723 724 725 726 727 728 729 730 731
#undef READWRITE
#undef RWContext
#undef xf
#undef xsu
#undef uvlc
#undef ns
#undef increment
#undef subexp
#undef delta_q
732
#undef leb128
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
#undef infer
#undef byte_alignment


static int cbs_av1_split_fragment(CodedBitstreamContext *ctx,
                                  CodedBitstreamFragment *frag,
                                  int header)
{
    GetBitContext gbc;
    uint8_t *data;
    size_t size;
    uint64_t obu_length;
    int pos, err, trace;

    // Don't include this parsing in trace output.
    trace = ctx->trace_enable;
    ctx->trace_enable = 0;

    data = frag->data;
    size = frag->data_size;

    if (INT_MAX / 8 < size) {
        av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid fragment: "
756
               "too large (%"SIZE_SPECIFIER" bytes).\n", size);
757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
        err = AVERROR_INVALIDDATA;
        goto fail;
    }

    while (size > 0) {
        AV1RawOBUHeader header;
        uint64_t obu_size;

        init_get_bits(&gbc, data, 8 * size);

        err = cbs_av1_read_obu_header(ctx, &gbc, &header);
        if (err < 0)
            goto fail;

        if (get_bits_left(&gbc) < 8) {
            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU: fragment "
773
                   "too short (%"SIZE_SPECIFIER" bytes).\n", size);
774 775 776 777
            err = AVERROR_INVALIDDATA;
            goto fail;
        }

778 779 780 781 782 783
        if (header.obu_has_size_field) {
            err = cbs_av1_read_leb128(ctx, &gbc, "obu_size", &obu_size);
            if (err < 0)
                goto fail;
        } else
            obu_size = size - 1 - header.obu_extension_flag;
784 785 786 787 788 789 790 791

        pos = get_bits_count(&gbc);
        av_assert0(pos % 8 == 0 && pos / 8 <= size);

        obu_length = pos / 8 + obu_size;

        if (size < obu_length) {
            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU length: "
792
                   "%"PRIu64", but only %"SIZE_SPECIFIER" bytes remaining in fragment.\n",
793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
                   obu_length, size);
            err = AVERROR_INVALIDDATA;
            goto fail;
        }

        err = ff_cbs_insert_unit_data(ctx, frag, -1, header.obu_type,
                                      data, obu_length, frag->data_ref);
        if (err < 0)
            goto fail;

        data += obu_length;
        size -= obu_length;
    }

    err = 0;
fail:
    ctx->trace_enable = trace;
    return err;
}

static void cbs_av1_free_tile_data(AV1RawTileData *td)
{
    av_buffer_unref(&td->data_ref);
}

818 819 820 821 822
static void cbs_av1_free_padding(AV1RawPadding *pd)
{
    av_buffer_unref(&pd->payload_ref);
}

823 824 825 826 827 828 829 830 831
static void cbs_av1_free_metadata(AV1RawMetadata *md)
{
    switch (md->metadata_type) {
    case AV1_METADATA_TYPE_ITUT_T35:
        av_buffer_unref(&md->metadata.itut_t35.payload_ref);
        break;
    }
}

832
static void cbs_av1_free_obu(void *opaque, uint8_t *content)
833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848
{
    AV1RawOBU *obu = (AV1RawOBU*)content;

    switch (obu->header.obu_type) {
    case AV1_OBU_TILE_GROUP:
        cbs_av1_free_tile_data(&obu->obu.tile_group.tile_data);
        break;
    case AV1_OBU_FRAME:
        cbs_av1_free_tile_data(&obu->obu.frame.tile_group.tile_data);
        break;
    case AV1_OBU_TILE_LIST:
        cbs_av1_free_tile_data(&obu->obu.tile_list.tile_data);
        break;
    case AV1_OBU_METADATA:
        cbs_av1_free_metadata(&obu->obu.metadata);
        break;
849 850 851
    case AV1_OBU_PADDING:
        cbs_av1_free_padding(&obu->obu.padding);
        break;
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    }

    av_freep(&obu);
}

static int cbs_av1_ref_tile_data(CodedBitstreamContext *ctx,
                                 CodedBitstreamUnit *unit,
                                 GetBitContext *gbc,
                                 AV1RawTileData *td)
{
    int pos;

    pos = get_bits_count(gbc);
    if (pos >= 8 * unit->data_size) {
        av_log(ctx->log_ctx, AV_LOG_ERROR, "Bitstream ended before "
               "any data in tile group (%d bits read).\n", pos);
        return AVERROR_INVALIDDATA;
    }
    // Must be byte-aligned at this point.
    av_assert0(pos % 8 == 0);

    td->data_ref = av_buffer_ref(unit->data_ref);
    if (!td->data_ref)
        return AVERROR(ENOMEM);

    td->data      = unit->data      + pos / 8;
    td->data_size = unit->data_size - pos / 8;

    return 0;
}

static int cbs_av1_read_unit(CodedBitstreamContext *ctx,
                             CodedBitstreamUnit *unit)
{
    CodedBitstreamAV1Context *priv = ctx->priv_data;
    AV1RawOBU *obu;
    GetBitContext gbc;
    int err, start_pos, end_pos;

    err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*obu),
                                    &cbs_av1_free_obu);
    if (err < 0)
        return err;
    obu = unit->content;

    err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
    if (err < 0)
        return err;

    err = cbs_av1_read_obu_header(ctx, &gbc, &obu->header);
    if (err < 0)
        return err;
    av_assert0(obu->header.obu_type == unit->type);

    if (obu->header.obu_has_size_field) {
        uint64_t obu_size;
        err = cbs_av1_read_leb128(ctx, &gbc, "obu_size", &obu_size);
        if (err < 0)
            return err;
        obu->obu_size = obu_size;
    } else {
        if (unit->data_size < 1 + obu->header.obu_extension_flag) {
            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU length: "
915
                   "unit too short (%"SIZE_SPECIFIER").\n", unit->data_size);
916 917 918 919 920 921 922 923 924
            return AVERROR_INVALIDDATA;
        }
        obu->obu_size = unit->data_size - 1 - obu->header.obu_extension_flag;
    }

    start_pos = get_bits_count(&gbc);

    if (obu->header.obu_extension_flag) {
        priv->temporal_id = obu->header.temporal_id;
925
        priv->spatial_id  = obu->header.spatial_id;
926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970

        if (obu->header.obu_type != AV1_OBU_SEQUENCE_HEADER &&
            obu->header.obu_type != AV1_OBU_TEMPORAL_DELIMITER &&
            priv->operating_point_idc) {
            int in_temporal_layer =
                (priv->operating_point_idc >>  priv->temporal_id    ) & 1;
            int in_spatial_layer  =
                (priv->operating_point_idc >> (priv->spatial_id + 8)) & 1;
            if (!in_temporal_layer || !in_spatial_layer) {
                // Decoding will drop this OBU at this operating point.
            }
        }
    } else {
        priv->temporal_id = 0;
        priv->spatial_id  = 0;
    }

    switch (obu->header.obu_type) {
    case AV1_OBU_SEQUENCE_HEADER:
        {
            err = cbs_av1_read_sequence_header_obu(ctx, &gbc,
                                                   &obu->obu.sequence_header);
            if (err < 0)
                return err;

            av_buffer_unref(&priv->sequence_header_ref);
            priv->sequence_header = NULL;

            priv->sequence_header_ref = av_buffer_ref(unit->content_ref);
            if (!priv->sequence_header_ref)
                return AVERROR(ENOMEM);
            priv->sequence_header = &obu->obu.sequence_header;
        }
        break;
    case AV1_OBU_TEMPORAL_DELIMITER:
        {
            err = cbs_av1_read_temporal_delimiter_obu(ctx, &gbc);
            if (err < 0)
                return err;
        }
        break;
    case AV1_OBU_FRAME_HEADER:
    case AV1_OBU_REDUNDANT_FRAME_HEADER:
        {
            err = cbs_av1_read_frame_header_obu(ctx, &gbc,
971 972 973 974
                                                &obu->obu.frame_header,
                                                obu->header.obu_type ==
                                                AV1_OBU_REDUNDANT_FRAME_HEADER,
                                                unit->data_ref);
975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993
            if (err < 0)
                return err;
        }
        break;
    case AV1_OBU_TILE_GROUP:
        {
            err = cbs_av1_read_tile_group_obu(ctx, &gbc,
                                              &obu->obu.tile_group);
            if (err < 0)
                return err;

            err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
                                        &obu->obu.tile_group.tile_data);
            if (err < 0)
                return err;
        }
        break;
    case AV1_OBU_FRAME:
        {
994 995
            err = cbs_av1_read_frame_obu(ctx, &gbc, &obu->obu.frame,
                                         unit->data_ref);
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025
            if (err < 0)
                return err;

            err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
                                        &obu->obu.frame.tile_group.tile_data);
            if (err < 0)
                return err;
        }
        break;
    case AV1_OBU_TILE_LIST:
        {
            err = cbs_av1_read_tile_list_obu(ctx, &gbc,
                                             &obu->obu.tile_list);
            if (err < 0)
                return err;

            err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
                                        &obu->obu.tile_list.tile_data);
            if (err < 0)
                return err;
        }
        break;
    case AV1_OBU_METADATA:
        {
            err = cbs_av1_read_metadata_obu(ctx, &gbc, &obu->obu.metadata);
            if (err < 0)
                return err;
        }
        break;
    case AV1_OBU_PADDING:
1026 1027 1028 1029 1030 1031
        {
            err = cbs_av1_read_padding_obu(ctx, &gbc, &obu->obu.padding);
            if (err < 0)
                return err;
        }
        break;
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
    default:
        return AVERROR(ENOSYS);
    }

    end_pos = get_bits_count(&gbc);
    av_assert0(end_pos <= unit->data_size * 8);

    if (obu->obu_size > 0 &&
        obu->header.obu_type != AV1_OBU_TILE_GROUP &&
        obu->header.obu_type != AV1_OBU_FRAME) {
1042 1043 1044 1045 1046 1047
        int nb_bits = obu->obu_size * 8 + start_pos - end_pos;

        if (nb_bits <= 0)
            return AVERROR_INVALIDDATA;

        err = cbs_av1_read_trailing_bits(ctx, &gbc, nb_bits);
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
        if (err < 0)
            return err;
    }

    return 0;
}

static int cbs_av1_write_obu(CodedBitstreamContext *ctx,
                             CodedBitstreamUnit *unit,
                             PutBitContext *pbc)
{
    CodedBitstreamAV1Context *priv = ctx->priv_data;
    AV1RawOBU *obu = unit->content;
    PutBitContext pbc_tmp;
    AV1RawTileData *td;
    size_t header_size;
    int err, start_pos, end_pos, data_pos;

    // OBUs in the normal bitstream format must contain a size field
    // in every OBU (in annex B it is optional, but we don't support
    // writing that).
    obu->header.obu_has_size_field = 1;

    err = cbs_av1_write_obu_header(ctx, pbc, &obu->header);
    if (err < 0)
        return err;

    if (obu->header.obu_has_size_field) {
        pbc_tmp = *pbc;
        // Add space for the size field to fill later.
        put_bits32(pbc, 0);
        put_bits32(pbc, 0);
    }

    td = NULL;
    start_pos = put_bits_count(pbc);

    switch (obu->header.obu_type) {
    case AV1_OBU_SEQUENCE_HEADER:
        {
            err = cbs_av1_write_sequence_header_obu(ctx, pbc,
                                                    &obu->obu.sequence_header);
            if (err < 0)
                return err;

            av_buffer_unref(&priv->sequence_header_ref);
            priv->sequence_header = NULL;

            priv->sequence_header_ref = av_buffer_ref(unit->content_ref);
            if (!priv->sequence_header_ref)
                return AVERROR(ENOMEM);
            priv->sequence_header = &obu->obu.sequence_header;
        }
        break;
    case AV1_OBU_TEMPORAL_DELIMITER:
        {
            err = cbs_av1_write_temporal_delimiter_obu(ctx, pbc);
            if (err < 0)
                return err;
        }
        break;
    case AV1_OBU_FRAME_HEADER:
    case AV1_OBU_REDUNDANT_FRAME_HEADER:
        {
            err = cbs_av1_write_frame_header_obu(ctx, pbc,
1113 1114 1115 1116
                                                 &obu->obu.frame_header,
                                                 obu->header.obu_type ==
                                                 AV1_OBU_REDUNDANT_FRAME_HEADER,
                                                 NULL);
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
            if (err < 0)
                return err;
        }
        break;
    case AV1_OBU_TILE_GROUP:
        {
            err = cbs_av1_write_tile_group_obu(ctx, pbc,
                                               &obu->obu.tile_group);
            if (err < 0)
                return err;

            td = &obu->obu.tile_group.tile_data;
        }
        break;
    case AV1_OBU_FRAME:
        {
1133
            err = cbs_av1_write_frame_obu(ctx, pbc, &obu->obu.frame, NULL);
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
            if (err < 0)
                return err;

            td = &obu->obu.frame.tile_group.tile_data;
        }
        break;
    case AV1_OBU_TILE_LIST:
        {
            err = cbs_av1_write_tile_list_obu(ctx, pbc, &obu->obu.tile_list);
            if (err < 0)
                return err;

            td = &obu->obu.tile_list.tile_data;
        }
        break;
    case AV1_OBU_METADATA:
        {
            err = cbs_av1_write_metadata_obu(ctx, pbc, &obu->obu.metadata);
            if (err < 0)
                return err;
        }
        break;
    case AV1_OBU_PADDING:
1157 1158 1159 1160 1161 1162
        {
            err = cbs_av1_write_padding_obu(ctx, pbc, &obu->obu.padding);
            if (err < 0)
                return err;
        }
        break;
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
    default:
        return AVERROR(ENOSYS);
    }

    end_pos = put_bits_count(pbc);
    header_size = (end_pos - start_pos + 7) / 8;
    if (td) {
        obu->obu_size = header_size + td->data_size;
    } else if (header_size > 0) {
        // Add trailing bits and recalculate.
        err = cbs_av1_write_trailing_bits(ctx, pbc, 8 - end_pos % 8);
        if (err < 0)
            return err;
        end_pos = put_bits_count(pbc);
1177
        obu->obu_size = header_size = (end_pos - start_pos + 7) / 8;
1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232
    } else {
        // Empty OBU.
        obu->obu_size = 0;
    }

    end_pos = put_bits_count(pbc);
    // Must now be byte-aligned.
    av_assert0(end_pos % 8 == 0);
    flush_put_bits(pbc);
    start_pos /= 8;
    end_pos   /= 8;

    *pbc = pbc_tmp;
    err = cbs_av1_write_leb128(ctx, pbc, "obu_size", obu->obu_size);
    if (err < 0)
        return err;

    data_pos = put_bits_count(pbc) / 8;
    flush_put_bits(pbc);
    av_assert0(data_pos <= start_pos);

    if (8 * obu->obu_size > put_bits_left(pbc))
        return AVERROR(ENOSPC);

    if (obu->obu_size > 0) {
        memmove(priv->write_buffer + data_pos,
                priv->write_buffer + start_pos, header_size);
        skip_put_bytes(pbc, header_size);

        if (td) {
            memcpy(priv->write_buffer + data_pos + header_size,
                   td->data, td->data_size);
            skip_put_bytes(pbc, td->data_size);
        }
    }

    return 0;
}

static int cbs_av1_write_unit(CodedBitstreamContext *ctx,
                              CodedBitstreamUnit *unit)
{
    CodedBitstreamAV1Context *priv = ctx->priv_data;
    PutBitContext pbc;
    int err;

    if (!priv->write_buffer) {
        // Initial write buffer size is 1MB.
        priv->write_buffer_size = 1024 * 1024;

    reallocate_and_try_again:
        err = av_reallocp(&priv->write_buffer, priv->write_buffer_size);
        if (err < 0) {
            av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
                   "sufficiently large write buffer (last attempt "
1233
                   "%"SIZE_SPECIFIER" bytes).\n", priv->write_buffer_size);
1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
            return err;
        }
    }

    init_put_bits(&pbc, priv->write_buffer, priv->write_buffer_size);

    err = cbs_av1_write_obu(ctx, unit, &pbc);
    if (err == AVERROR(ENOSPC)) {
        // Overflow.
        priv->write_buffer_size *= 2;
        goto reallocate_and_try_again;
    }
    if (err < 0)
        return err;

    // Overflow but we didn't notice.
    av_assert0(put_bits_count(&pbc) <= 8 * priv->write_buffer_size);

    // OBU data must be byte-aligned.
    av_assert0(put_bits_count(&pbc) % 8 == 0);

    unit->data_size = put_bits_count(&pbc) / 8;
    flush_put_bits(&pbc);

    err = ff_cbs_alloc_unit_data(ctx, unit, unit->data_size);
    if (err < 0)
        return err;

    memcpy(unit->data, priv->write_buffer, unit->data_size);

    return 0;
}

static int cbs_av1_assemble_fragment(CodedBitstreamContext *ctx,
                                     CodedBitstreamFragment *frag)
{
    size_t size, pos;
    int i;

    size = 0;
    for (i = 0; i < frag->nb_units; i++)
        size += frag->units[i].data_size;

    frag->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
    if (!frag->data_ref)
        return AVERROR(ENOMEM);
    frag->data = frag->data_ref->data;
    memset(frag->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);

    pos = 0;
    for (i = 0; i < frag->nb_units; i++) {
        memcpy(frag->data + pos, frag->units[i].data,
               frag->units[i].data_size);
        pos += frag->units[i].data_size;
    }
    av_assert0(pos == size);
    frag->data_size = size;

    return 0;
}

static void cbs_av1_close(CodedBitstreamContext *ctx)
{
    CodedBitstreamAV1Context *priv = ctx->priv_data;

    av_buffer_unref(&priv->sequence_header_ref);
1300
    av_buffer_unref(&priv->frame_header_ref);
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316

    av_freep(&priv->write_buffer);
}

const CodedBitstreamType ff_cbs_type_av1 = {
    .codec_id          = AV_CODEC_ID_AV1,

    .priv_data_size    = sizeof(CodedBitstreamAV1Context),

    .split_fragment    = &cbs_av1_split_fragment,
    .read_unit         = &cbs_av1_read_unit,
    .write_unit        = &cbs_av1_write_unit,
    .assemble_fragment = &cbs_av1_assemble_fragment,

    .close             = &cbs_av1_close,
};