avcodec: estimate output bitrate for uncompressed video codecs

Allows to get a more realistic total bitrate (and estimated file size)
in avi_write_header. Previously a static default value of 200k was
assumed.

Adds an internal helper function for bitrate guessing.
Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/internal.h

@@ -363,4 +363,10 @@ int ff_side_data_set_encoder_stats(AVPacket *pkt, int quality, int64_t *error, i
 int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len,
                      void **data, size_t *sei_size);
 
+/**
+ * Get an estimated video bitrate based on frame size, frame rate and coded
+ * bits per pixel.
+ */
+int64_t ff_guess_coded_bitrate(AVCodecContext *avctx);
+
 #endif /* AVCODEC_INTERNAL_H */

libavcodec/r210enc.c

@@ -24,6 +24,18 @@
 #include "internal.h"
 #include "bytestream.h"
 
+static av_cold int encode_init(AVCodecContext *avctx)
+{
+    int aligned_width = FFALIGN(avctx->width,
+                                avctx->codec_id == AV_CODEC_ID_R10K ? 1 : 64);
+
+    avctx->bits_per_coded_sample = 32;
+    if (avctx->width > 0)
+        avctx->bit_rate = ff_guess_coded_bitrate(avctx) * aligned_width / avctx->width;
+
+    return 0;
+}
+
 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                         const AVFrame *pic, int *got_packet)
 {
@@ -73,6 +85,7 @@ AVCodec ff_r210_encoder = {
     .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed RGB 10-bit"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_R210,
+    .init           = encode_init,
     .encode2        = encode_frame,
     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_RGB48, AV_PIX_FMT_NONE },
     .capabilities   = AV_CODEC_CAP_INTRA_ONLY,
@@ -84,6 +97,7 @@ AVCodec ff_r10k_encoder = {
     .long_name      = NULL_IF_CONFIG_SMALL("AJA Kona 10-bit RGB Codec"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_R10K,
+    .init           = encode_init,
     .encode2        = encode_frame,
     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_RGB48, AV_PIX_FMT_NONE },
     .capabilities   = AV_CODEC_CAP_INTRA_ONLY,
@@ -95,6 +109,7 @@ AVCodec ff_avrp_encoder = {
     .long_name      = NULL_IF_CONFIG_SMALL("Avid 1:1 10-bit RGB Packer"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_AVRP,
+    .init           = encode_init,
     .encode2        = encode_frame,
     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_RGB48, AV_PIX_FMT_NONE },
     .capabilities   = AV_CODEC_CAP_INTRA_ONLY,

libavcodec/rawenc.c

@@ -44,6 +44,8 @@ FF_ENABLE_DEPRECATION_WARNINGS
     avctx->bits_per_coded_sample = av_get_bits_per_pixel(desc);
     if(!avctx->codec_tag)
         avctx->codec_tag = avcodec_pix_fmt_to_codec_tag(avctx->pix_fmt);
+    avctx->bit_rate = ff_guess_coded_bitrate(avctx);
+
     return 0;
 }
 

libavcodec/utils.c

@@ -4343,3 +4343,24 @@ int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len,
 
     return 0;
 }
+
+int64_t ff_guess_coded_bitrate(AVCodecContext *avctx)
+{
+    AVRational framerate = avctx->framerate;
+    int bits_per_coded_sample = avctx->bits_per_coded_sample;
+    int64_t bitrate;
+
+    if (!(framerate.num && framerate.den))
+        framerate = av_inv_q(avctx->time_base);
+    if (!(framerate.num && framerate.den))
+        return 0;
+
+    if (!bits_per_coded_sample) {
+        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
+        bits_per_coded_sample = av_get_bits_per_pixel(desc);
+    }
+    bitrate = (int64_t)bits_per_coded_sample * avctx->width * avctx->height *
+              framerate.num / framerate.den;
+
+    return bitrate;
+}

libavcodec/v210enc.c

@@ -110,6 +110,9 @@ FF_ENABLE_DEPRECATION_WARNINGS
 
     ff_v210enc_init(s);
 
+    avctx->bits_per_coded_sample = 20;
+    avctx->bit_rate = ff_guess_coded_bitrate(avctx) * 16 / 15;
+
     return 0;
 }
 

libavcodec/v308enc.c

@@ -31,6 +31,9 @@ static av_cold int v308_encode_init(AVCodecContext *avctx)
         return AVERROR_INVALIDDATA;
     }
 
+    avctx->bits_per_coded_sample = 24;
+    avctx->bit_rate = ff_guess_coded_bitrate(avctx);
+
     return 0;
 }
 

libavcodec/v408enc.c

@@ -26,6 +26,8 @@
 
 static av_cold int v408_encode_init(AVCodecContext *avctx)
 {
+    avctx->bits_per_coded_sample = 32;
+    avctx->bit_rate = ff_guess_coded_bitrate(avctx);
 
     return 0;
 }

libavcodec/v410enc.c

@@ -32,6 +32,9 @@ static av_cold int v410_encode_init(AVCodecContext *avctx)
         return AVERROR_INVALIDDATA;
     }
 
+    avctx->bits_per_coded_sample = 32;
+    avctx->bit_rate = ff_guess_coded_bitrate(avctx);
+
     return 0;
 }
 

libavcodec/y41penc.c

@@ -31,6 +31,7 @@ static av_cold int y41p_encode_init(AVCodecContext *avctx)
     }
 
     avctx->bits_per_coded_sample = 12;
+    avctx->bit_rate = ff_guess_coded_bitrate(avctx);
 
     return 0;
 }

tests/ref/fate/v410enc

-f7cf1b743c18f74d047ce8d6ea05d3d9
+5fd2d9a7b3311f5c19dbdd647bb9eae6

tests/ref/vsynth/vsynth1-bpp1

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 640460 tests/data/fate/vsynth1-bpp1.avi
 cd1e1448d9895561347ceb66d0add34d *tests/data/fate/vsynth1-bpp1.out.rawvideo
 stddev:   84.48 PSNR:  9.60 MAXDIFF:  218 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth1-bpp15

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 10144452 tests/data/fate/vsynth1-bpp15.avi
 3aee2d6e82a9507d7f01844c04d2b57b *tests/data/fate/vsynth1-bpp15.out.rawvideo
 stddev:   38.44 PSNR: 16.43 MAXDIFF:  159 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth1-r210

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 22125252 tests/data/fate/vsynth1-r210.avi
 ecaafa9eec11b5e1453a63ed6d194eed *tests/data/fate/vsynth1-r210.out.rawvideo
 stddev:    3.23 PSNR: 37.94 MAXDIFF:   48 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth1-rgb

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 15213252 tests/data/fate/vsynth1-rgb.avi
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 stddev:    3.42 PSNR: 37.44 MAXDIFF:   48 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth1-v210

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 14752452 tests/data/fate/vsynth1-v210.avi
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tests/ref/vsynth/vsynth1-v210-10

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 14752452 tests/data/fate/vsynth1-v210-10.avi
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 stddev:    1.85 PSNR: 42.78 MAXDIFF:   29 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth1-v308

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 15213252 tests/data/fate/vsynth1-v308.avi
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 stddev:    2.67 PSNR: 39.60 MAXDIFF:   43 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth1-v408

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 20282052 tests/data/fate/vsynth1-v408.avi
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 stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth1-y41p

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 7610052 tests/data/fate/vsynth1-y41p.avi
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 stddev:    5.98 PSNR: 32.59 MAXDIFF:   87 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth1-yuv

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 7610052 tests/data/fate/vsynth1-yuv.avi
 c5ccac874dbf808e9088bc3107860042 *tests/data/fate/vsynth1-yuv.out.rawvideo
 stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth2-bpp1

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 640460 tests/data/fate/vsynth2-bpp1.avi
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 stddev:   68.98 PSNR: 11.36 MAXDIFF:  218 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth2-bpp15

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 10144452 tests/data/fate/vsynth2-bpp15.avi
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 stddev:   33.97 PSNR: 17.51 MAXDIFF:  154 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth2-r210

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 22125252 tests/data/fate/vsynth2-r210.avi
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 stddev:    1.17 PSNR: 46.71 MAXDIFF:   15 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth2-rgb

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 15213252 tests/data/fate/vsynth2-rgb.avi
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 stddev:    1.54 PSNR: 44.37 MAXDIFF:   17 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth2-v210

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 stddev:    0.40 PSNR: 56.06 MAXDIFF:    9 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth2-v210-10

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 14752452 tests/data/fate/vsynth2-v210-10.avi
 8bb1c449e1a2a94fd0d98841c04246bb *tests/data/fate/vsynth2-v210-10.out.rawvideo
 stddev:    0.39 PSNR: 56.17 MAXDIFF:    9 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth2-v308

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 stddev:    0.50 PSNR: 54.10 MAXDIFF:   13 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth2-v408

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 stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth2-y41p

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 7610052 tests/data/fate/vsynth2-y41p.avi
 7c760febffcf1c2e43e494f38b010af1 *tests/data/fate/vsynth2-y41p.out.rawvideo
 stddev:    1.32 PSNR: 45.72 MAXDIFF:   34 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth2-yuv

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tests/ref/vsynth/vsynth3-bpp1

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 stddev:   84.76 PSNR:  9.57 MAXDIFF:  232 bytes:    86700/    86700

tests/ref/vsynth/vsynth3-bpp15

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 122452 tests/data/fate/vsynth3-bpp15.avi
 85ac2fa98252ae907b97a7a561ca676f *tests/data/fate/vsynth3-bpp15.out.rawvideo
 stddev:   37.76 PSNR: 16.59 MAXDIFF:  156 bytes:    86700/    86700

tests/ref/vsynth/vsynth3-r210

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 442052 tests/data/fate/vsynth3-r210.avi
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 stddev:    3.48 PSNR: 37.28 MAXDIFF:   42 bytes:    86700/    86700

tests/ref/vsynth/vsynth3-rgb

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tests/ref/vsynth/vsynth3-v210

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 stddev:    2.11 PSNR: 41.61 MAXDIFF:   27 bytes:    86700/    86700

tests/ref/vsynth/vsynth3-v210-10

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tests/ref/vsynth/vsynth3-v308

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tests/ref/vsynth/vsynth3-v408

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tests/ref/vsynth/vsynth3-yuv

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tests/ref/vsynth/vsynth_lena-bpp1

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 stddev:   83.28 PSNR:  9.72 MAXDIFF:  215 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth_lena-bpp15

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tests/ref/vsynth/vsynth_lena-r210

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 stddev:    0.70 PSNR: 51.12 MAXDIFF:   12 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth_lena-rgb

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 stddev:    1.26 PSNR: 46.10 MAXDIFF:   13 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth_lena-v210

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 stddev:    0.34 PSNR: 57.41 MAXDIFF:    6 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth_lena-v210-10

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 stddev:    0.34 PSNR: 57.43 MAXDIFF:    6 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth_lena-v308

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 stddev:    0.41 PSNR: 55.80 MAXDIFF:    7 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth_lena-v408

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 stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth_lena-y41p

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 stddev:    1.07 PSNR: 47.54 MAXDIFF:   21 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth_lena-yuv

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 7610052 tests/data/fate/vsynth_lena-yuv.avi
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 stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  7603200/  7603200