options.c 10.8 KB
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/*
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 * Copyright (c) 2001 Fabrice Bellard
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 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
 *
 * 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
 */

/**
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 * @file
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 * Options definition for AVCodecContext.
 */

#include "avcodec.h"
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#include "internal.h"
#include "libavutil/avassert.h"
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#include "libavutil/internal.h"
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include <string.h>
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FF_DISABLE_DEPRECATION_WARNINGS
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#include "options_table.h"
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FF_ENABLE_DEPRECATION_WARNINGS
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static const char* context_to_name(void* ptr) {
    AVCodecContext *avc= ptr;

    if(avc && avc->codec && avc->codec->name)
        return avc->codec->name;
    else
        return "NULL";
}

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static void *codec_child_next(void *obj, void *prev)
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{
    AVCodecContext *s = obj;
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    if (!prev && s->codec && s->codec->priv_class && s->priv_data)
        return s->priv_data;
    return NULL;
}

static const AVClass *codec_child_class_next(const AVClass *prev)
{
    AVCodec *c = NULL;
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    /* find the codec that corresponds to prev */
    while (prev && (c = av_codec_next(c)))
        if (c->priv_class == prev)
            break;
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    /* find next codec with priv options */
    while (c = av_codec_next(c))
        if (c->priv_class)
            return c->priv_class;
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    return NULL;
}

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static AVClassCategory get_category(void *ptr)
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{
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    AVCodecContext* avctx = ptr;
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    if(avctx->codec && avctx->codec->decode) return AV_CLASS_CATEGORY_DECODER;
    else                                     return AV_CLASS_CATEGORY_ENCODER;
}

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static const AVClass av_codec_context_class = {
    .class_name              = "AVCodecContext",
    .item_name               = context_to_name,
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    .option                  = avcodec_options,
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    .version                 = LIBAVUTIL_VERSION_INT,
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    .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),
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    .child_next              = codec_child_next,
    .child_class_next        = codec_child_class_next,
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    .category                = AV_CLASS_CATEGORY_ENCODER,
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    .get_category            = get_category,
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};
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static int init_context_defaults(AVCodecContext *s, const AVCodec *codec)
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{
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    int flags=0;
    memset(s, 0, sizeof(AVCodecContext));

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    s->av_class = &av_codec_context_class;
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    s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
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    if (codec) {
        s->codec = codec;
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        s->codec_id = codec->id;
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    }
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    if(s->codec_type == AVMEDIA_TYPE_AUDIO)
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        flags= AV_OPT_FLAG_AUDIO_PARAM;
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    else if(s->codec_type == AVMEDIA_TYPE_VIDEO)
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        flags= AV_OPT_FLAG_VIDEO_PARAM;
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    else if(s->codec_type == AVMEDIA_TYPE_SUBTITLE)
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        flags= AV_OPT_FLAG_SUBTITLE_PARAM;
    av_opt_set_defaults2(s, flags, flags);

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    s->time_base           = (AVRational){0,1};
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    s->framerate           = (AVRational){ 0, 1 };
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    s->pkt_timebase        = (AVRational){ 0, 1 };
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    s->get_buffer2         = avcodec_default_get_buffer2;
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    s->get_format          = avcodec_default_get_format;
    s->execute             = avcodec_default_execute;
    s->execute2            = avcodec_default_execute2;
    s->sample_aspect_ratio = (AVRational){0,1};
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    s->pix_fmt             = AV_PIX_FMT_NONE;
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    s->sw_pix_fmt          = AV_PIX_FMT_NONE;
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    s->sample_fmt          = AV_SAMPLE_FMT_NONE;
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    s->reordered_opaque    = AV_NOPTS_VALUE;
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    if(codec && codec->priv_data_size){
        if(!s->priv_data){
            s->priv_data= av_mallocz(codec->priv_data_size);
            if (!s->priv_data) {
                return AVERROR(ENOMEM);
            }
        }
        if(codec->priv_class){
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            *(const AVClass**)s->priv_data = codec->priv_class;
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            av_opt_set_defaults(s->priv_data);
        }
    }
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    if (codec && codec->defaults) {
        int ret;
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        const AVCodecDefault *d = codec->defaults;
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        while (d->key) {
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            ret = av_opt_set(s, d->key, d->value, 0);
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            av_assert0(ret >= 0);
            d++;
        }
    }
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    return 0;
}

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#if FF_API_GET_CONTEXT_DEFAULTS
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
{
    return init_context_defaults(s, codec);
}
#endif

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AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
{
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    AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));

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    if (!avctx)
        return NULL;
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    if (init_context_defaults(avctx, codec) < 0) {
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        av_free(avctx);
        return NULL;
    }

    return avctx;
}

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void avcodec_free_context(AVCodecContext **pavctx)
{
    AVCodecContext *avctx = *pavctx;

    if (!avctx)
        return;

    avcodec_close(avctx);

    av_freep(&avctx->extradata);
    av_freep(&avctx->subtitle_header);
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    av_freep(&avctx->intra_matrix);
    av_freep(&avctx->inter_matrix);
    av_freep(&avctx->rc_override);
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    av_freep(pavctx);
}

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#if FF_API_COPY_CONTEXT
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static void copy_context_reset(AVCodecContext *avctx)
{
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    int i;

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    av_opt_free(avctx);
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#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
    av_frame_free(&avctx->coded_frame);
FF_ENABLE_DEPRECATION_WARNINGS
#endif
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    av_freep(&avctx->rc_override);
    av_freep(&avctx->intra_matrix);
    av_freep(&avctx->inter_matrix);
    av_freep(&avctx->extradata);
    av_freep(&avctx->subtitle_header);
    av_buffer_unref(&avctx->hw_frames_ctx);
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    av_buffer_unref(&avctx->hw_device_ctx);
    for (i = 0; i < avctx->nb_coded_side_data; i++)
        av_freep(&avctx->coded_side_data[i].data);
    av_freep(&avctx->coded_side_data);
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    avctx->subtitle_header_size = 0;
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    avctx->nb_coded_side_data = 0;
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    avctx->extradata_size = 0;
}

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int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
{
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    const AVCodec *orig_codec = dest->codec;
    uint8_t *orig_priv_data = dest->priv_data;

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    if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
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        av_log(dest, AV_LOG_ERROR,
               "Tried to copy AVCodecContext %p into already-initialized %p\n",
               src, dest);
        return AVERROR(EINVAL);
    }
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    copy_context_reset(dest);
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    memcpy(dest, src, sizeof(*dest));
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    av_opt_copy(dest, src);
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    dest->priv_data       = orig_priv_data;
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    dest->codec           = orig_codec;
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    if (orig_priv_data && src->codec && src->codec->priv_class &&
        dest->codec && dest->codec->priv_class)
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        av_opt_copy(orig_priv_data, src->priv_data);

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    /* set values specific to opened codecs back to their default state */
    dest->slice_offset    = NULL;
    dest->hwaccel         = NULL;
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    dest->internal        = NULL;
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#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
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    dest->coded_frame     = NULL;
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FF_ENABLE_DEPRECATION_WARNINGS
#endif
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    /* reallocate values that should be allocated separately */
    dest->extradata       = NULL;
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    dest->coded_side_data = NULL;
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    dest->intra_matrix    = NULL;
    dest->inter_matrix    = NULL;
    dest->rc_override     = NULL;
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    dest->subtitle_header = NULL;
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    dest->hw_frames_ctx   = NULL;
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    dest->hw_device_ctx   = NULL;
    dest->nb_coded_side_data = 0;
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#define alloc_and_copy_or_fail(obj, size, pad) \
    if (src->obj && size > 0) { \
        dest->obj = av_malloc(size + pad); \
        if (!dest->obj) \
            goto fail; \
        memcpy(dest->obj, src->obj, size); \
        if (pad) \
            memset(((uint8_t *) dest->obj) + size, 0, pad); \
    }
    alloc_and_copy_or_fail(extradata,    src->extradata_size,
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                           AV_INPUT_BUFFER_PADDING_SIZE);
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    dest->extradata_size  = src->extradata_size;
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    alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
    alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
    alloc_and_copy_or_fail(rc_override,  src->rc_override_count * sizeof(*src->rc_override), 0);
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    alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 1);
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    av_assert0(dest->subtitle_header_size == src->subtitle_header_size);
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#undef alloc_and_copy_or_fail

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    if (src->hw_frames_ctx) {
        dest->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
        if (!dest->hw_frames_ctx)
            goto fail;
    }

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    return 0;

fail:
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    copy_context_reset(dest);
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    return AVERROR(ENOMEM);
}
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#endif
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const AVClass *avcodec_get_class(void)
{
    return &av_codec_context_class;
}
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#define FOFFSET(x) offsetof(AVFrame,x)

static const AVOption frame_options[]={
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{"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},
{"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
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{"pkt_size", "", FOFFSET(pkt_size), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
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{"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},
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{"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
{"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
{"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.i64 = -1 }, 0, INT_MAX, 0},
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{"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, 0},
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{"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
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{NULL},
};

static const AVClass av_frame_class = {
    .class_name              = "AVFrame",
    .item_name               = NULL,
    .option                  = frame_options,
    .version                 = LIBAVUTIL_VERSION_INT,
};

const AVClass *avcodec_get_frame_class(void)
{
    return &av_frame_class;
}
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#define SROFFSET(x) offsetof(AVSubtitleRect,x)

static const AVOption subtitle_rect_options[]={
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{"x", "", SROFFSET(x), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
{"y", "", SROFFSET(y), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
{"w", "", SROFFSET(w), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
{"h", "", SROFFSET(h), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
{"type", "", SROFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
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{"flags", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0, "flags"},
{"forced", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0},
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{NULL},
};

static const AVClass av_subtitle_rect_class = {
    .class_name             = "AVSubtitleRect",
    .item_name              = NULL,
    .option                 = subtitle_rect_options,
    .version                = LIBAVUTIL_VERSION_INT,
};

const AVClass *avcodec_get_subtitle_rect_class(void)
{
    return &av_subtitle_rect_class;
}