[FFmpeg-devel] [PATCH] avcodec: add IMM5 decoder

Paul B Mahol onemda at gmail.com
Tue Jul 16 16:45:38 EEST 2019


On 7/16/19, Andreas Rheinhardt <andreas.rheinhardt at gmail.com> wrote:
> Paul B Mahol:
>> Signed-off-by: Paul B Mahol <onemda at gmail.com>
>> ---
>>  configure               |   1 +
>>  libavcodec/Makefile     |   1 +
>>  libavcodec/allcodecs.c  |   1 +
>>  libavcodec/avcodec.h    |   1 +
>>  libavcodec/codec_desc.c |   7 ++
>>  libavcodec/imm5.c       | 171 ++++++++++++++++++++++++++++++++++++++++
>>  libavformat/riff.c      |   1 +
>>  7 files changed, 183 insertions(+)
>>  create mode 100644 libavcodec/imm5.c
>>
>> diff --git a/configure b/configure
>> index 5a4f507246..d03cf43350 100755
>> --- a/configure
>> +++ b/configure
>> @@ -2714,6 +2714,7 @@ huffyuv_encoder_select="bswapdsp huffman
>> huffyuvencdsp llvidencdsp"
>>  hymt_decoder_select="huffyuv_decoder"
>>  iac_decoder_select="imc_decoder"
>>  imc_decoder_select="bswapdsp fft mdct sinewin"
>> +imm5_decoder_select="h264_decoder hevc_decoder"
>>  indeo3_decoder_select="hpeldsp"
>>  indeo4_decoder_select="ividsp"
>>  indeo5_decoder_select="ividsp"
>> diff --git a/libavcodec/Makefile b/libavcodec/Makefile
>> index 3cd73fbcc6..39f4d9118c 100644
>> --- a/libavcodec/Makefile
>> +++ b/libavcodec/Makefile
>> @@ -393,6 +393,7 @@ OBJS-$(CONFIG_IFF_ILBM_DECODER)        += iff.o
>>  OBJS-$(CONFIG_ILBC_DECODER)            += ilbcdec.o
>>  OBJS-$(CONFIG_IMC_DECODER)             += imc.o
>>  OBJS-$(CONFIG_IMM4_DECODER)            += imm4.o
>> +OBJS-$(CONFIG_IMM5_DECODER)            += imm5.o
>>  OBJS-$(CONFIG_INDEO2_DECODER)          += indeo2.o
>>  OBJS-$(CONFIG_INDEO3_DECODER)          += indeo3.o
>>  OBJS-$(CONFIG_INDEO4_DECODER)          += indeo4.o ivi.o
>> diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
>> index d2f9a39ce5..fe7f773925 100644
>> --- a/libavcodec/allcodecs.c
>> +++ b/libavcodec/allcodecs.c
>> @@ -158,6 +158,7 @@ extern AVCodec ff_hymt_decoder;
>>  extern AVCodec ff_idcin_decoder;
>>  extern AVCodec ff_iff_ilbm_decoder;
>>  extern AVCodec ff_imm4_decoder;
>> +extern AVCodec ff_imm5_decoder;
>>  extern AVCodec ff_indeo2_decoder;
>>  extern AVCodec ff_indeo3_decoder;
>>  extern AVCodec ff_indeo4_decoder;
>> diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
>> index 2528bd89ab..da6f92b443 100644
>> --- a/libavcodec/avcodec.h
>> +++ b/libavcodec/avcodec.h
>> @@ -457,6 +457,7 @@ enum AVCodecID {
>>      AV_CODEC_ID_AGM,
>>      AV_CODEC_ID_LSCR,
>>      AV_CODEC_ID_VP4,
>> +    AV_CODEC_ID_IMM5,
>>
>>      /* various PCM "codecs" */
>>      AV_CODEC_ID_FIRST_AUDIO = 0x10000,     ///< A dummy id pointing at
>> the start of audio codecs
>> diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
>> index 4d033c20ff..e6373be504 100644
>> --- a/libavcodec/codec_desc.c
>> +++ b/libavcodec/codec_desc.c
>> @@ -1726,6 +1726,13 @@ static const AVCodecDescriptor codec_descriptors[]
>> = {
>>          .long_name = NULL_IF_CONFIG_SMALL("On2 VP4"),
>>          .props     = AV_CODEC_PROP_LOSSY,
>>      },
>> +    {
>> +        .id        = AV_CODEC_ID_IMM5,
>> +        .type      = AVMEDIA_TYPE_VIDEO,
>> +        .name      = "imm5",
>> +        .long_name = NULL_IF_CONFIG_SMALL("Infinity IMM5"),
>> +        .props     = AV_CODEC_PROP_LOSSY,
>> +    },
>>
>>      /* various PCM "codecs" */
>>      {
>> diff --git a/libavcodec/imm5.c b/libavcodec/imm5.c
>> new file mode 100644
>> index 0000000000..d1bac342d0
>> --- /dev/null
>> +++ b/libavcodec/imm5.c
>> @@ -0,0 +1,171 @@
>> +/*
>> + * Copyright (c) 2019 Paul B Mahol
>> + *
>> + * 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/intreadwrite.h"
>> +
>> +#include "avcodec.h"
>> +#include "internal.h"
>> +
>> +typedef struct IMM5Context {
>> +    AVCodecContext *h264_avctx;   // wrapper context for H264
>> +    AVCodecContext *hevc_avctx;   // wrapper context for HEVC
>> +} IMM5Context;
>> +
>> +static const struct IMM5_unit {
>> +    uint8_t bits[14];
>> +    uint8_t len;
>> +} IMM5_units[14] = {
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x0B, 0x0F,
>> 0x88 }, 12 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x83,
>> 0xE2 }, 12 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x81,
>> 0xE8, 0x80 }, 13 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x0B, 0x04,
>> 0xA2 }, 12 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x81,
>> 0x28, 0x80 }, 13 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x80,
>> 0x92, 0x20 }, 13 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x0B,
>> 0x0F, 0xC8 }, 13 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05,
>> 0x83, 0xF2 }, 13 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05,
>> 0x81, 0xEC, 0x80 }, 14 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x0B,
>> 0x04, 0xB2 }, 13 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05,
>> 0x81, 0x2C, 0x80 }, 14 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05,
>> 0x80, 0x93, 0x20 }, 14 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x68, 0xDE, 0x3C, 0x80 }, 8 },
>> +    { { 0x00, 0x00, 0x00, 0x01, 0x68, 0xCE, 0x32, 0x28 }, 8 },
>> +};
>> +
>> +static av_cold int imm5_init(AVCodecContext *avctx)
>> +{
>> +    IMM5Context *ctx = avctx->priv_data;
>> +    const AVCodec *codec;
>> +    int ret;
>> +
>> +    codec = avcodec_find_decoder(AV_CODEC_ID_H264);
>> +    if (!codec)
>> +        return AVERROR_BUG;
>> +    ctx->h264_avctx = avcodec_alloc_context3(codec);
>> +    if (!ctx->h264_avctx)
>> +        return AVERROR(ENOMEM);
>> +    ctx->h264_avctx->thread_count = 1;
>> +    ctx->h264_avctx->flags        = avctx->flags;
>> +    ctx->h264_avctx->flags2       = avctx->flags2;
>> +    ret = ff_codec_open2_recursive(ctx->h264_avctx, codec, NULL);
>> +    if (ret < 0)
>> +        return ret;
>> +
>> +    codec = avcodec_find_decoder(AV_CODEC_ID_HEVC);
>> +    if (!codec)
>> +        return AVERROR_BUG;
>> +    ctx->hevc_avctx = avcodec_alloc_context3(codec);
>> +    if (!ctx->hevc_avctx)
>> +        return AVERROR(ENOMEM);
>> +    ctx->hevc_avctx->thread_count = 1;
>> +    ctx->hevc_avctx->flags        = avctx->flags;
>> +    ctx->hevc_avctx->flags2       = avctx->flags2;
>> +    ret = ff_codec_open2_recursive(ctx->hevc_avctx, codec, NULL);
>> +    if (ret < 0)
>> +        return ret;
>> +
>> +    return 0;
>> +}
>> +
>> +static int imm5_decode_frame(AVCodecContext *avctx, void *data,
>> +                             int *got_frame, AVPacket *avpkt)
>> +{
>> +    IMM5Context *ctx = avctx->priv_data;
>> +    AVFrame *frame = data;
>> +    AVCodecContext *codec_avctx = ctx->h264_avctx;
>> +    int ret;
>> +
>> +    if (avpkt->size > 24 && avpkt->data[8] <= 1 && AV_RL32(avpkt->data +
>> 4) + 24ULL <= avpkt->size) {
>> +        int codec_type = avpkt->data[1];
>> +        int index = avpkt->data[10];
>> +        int new_size = AV_RL32(avpkt->data + 4);
>> +        int offset, off;
> Nit: These variables are only used in the block below and could
> therefore be moved there.
>> +
>> +        if (codec_type == 0xA)
>> +            codec_avctx = ctx->hevc_avctx;
>> +
>> +        if (index >= 1 && index <= 12) {
>> +            ret = av_packet_make_writable(avpkt);
> Making the packet writable here will copy the whole buffer; if
> new_size is much smaller than avpkt->size (I don't know if this really
> happens), it will copy lots of unnecessary data. Move this call
> directly before memcpy to avoid this.

Not needed. New size is always by 24 less than packet size.

>> +            if (ret < 0)
>> +                return ret;
>> +
>> +            index -= 1;
>> +            off = offset = IMM5_units[index].len;
>> +            if (codec_type == 2) {
>> +                offset += IMM5_units[12].len;
>> +            } else {
>> +                offset += IMM5_units[13].len;
>> +            }
>> +
>> +            avpkt->data += 24 - offset;
>> +            avpkt->size = new_size + offset;
>> +
>> +            memcpy(avpkt->data, IMM5_units[index].bits,
>> IMM5_units[index].len);
>> +            if (codec_type == 2) {
>> +                memcpy(avpkt->data + off, IMM5_units[12].bits,
>> IMM5_units[12].len);
>> +            } else {
>> +                memcpy(avpkt->data + off, IMM5_units[13].bits,
>> IMM5_units[13].len);
>> +            }
>> +        } else {
>> +            avpkt->data += 24;
>> +            avpkt->size -= 24;
> Is the new_size only valid if 1 <= index <= 12? I'm wondering whether
> the above should not really be avpkt->size = new_size;

It could be, but it does not make a difference.

>> +        }
>> +    }
>> +
>> +    ret = avcodec_send_packet(codec_avctx, avpkt);
>> +    if (ret < 0) {
>> +        av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for
>> decoding\n");
>> +        return ret;
>> +    }
>> +
>> +    ret = avcodec_receive_frame(codec_avctx, frame);
>> +    if (ret < 0)
>> +        return ret;
>> +
>> +    avctx->pix_fmt = codec_avctx->pix_fmt;
>> +    avctx->width   = codec_avctx->width;
>> +    avctx->height  = codec_avctx->height;
>> +
>> +    *got_frame = 1;
>> +
>> +    return avpkt->size;
>> +}
>> +
>> +static av_cold int imm5_close(AVCodecContext *avctx)
>> +{
>> +    IMM5Context *ctx = avctx->priv_data;
>> +
>> +    avcodec_free_context(&ctx->h264_avctx);
>> +    avcodec_free_context(&ctx->hevc_avctx);
>> +
>> +    return 0;
>> +}
>> +
>> +AVCodec ff_imm5_decoder = {
>> +    .name           = "imm5",
>> +    .long_name      = NULL_IF_CONFIG_SMALL("Infinity IMM5"),
>> +    .type           = AVMEDIA_TYPE_VIDEO,
>> +    .id             = AV_CODEC_ID_IMM5,
>> +    .init           = imm5_init,
>> +    .decode         = imm5_decode_frame,
>> +    .close          = imm5_close,
>> +    .priv_data_size = sizeof(IMM5Context),
>> +    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
>> +                      FF_CODEC_CAP_INIT_CLEANUP,
>> +};
>> diff --git a/libavformat/riff.c b/libavformat/riff.c
>> index e755ad8d5f..610974ebf0 100644
>> --- a/libavformat/riff.c
>> +++ b/libavformat/riff.c
>> @@ -488,6 +488,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
>>      { AV_CODEC_ID_AGM,          MKTAG('A', 'G', 'M', '6') },
>>      { AV_CODEC_ID_AGM,          MKTAG('A', 'G', 'M', '7') },
>>      { AV_CODEC_ID_LSCR,         MKTAG('L', 'S', 'C', 'R') },
>> +    { AV_CODEC_ID_IMM5,         MKTAG('I', 'M', 'M', '5') },
>>      { AV_CODEC_ID_NONE,         0 }
>>  };
>>
>>
>
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