[FFmpeg-devel] [PATCH 1/3] avcodec/agm: add support for higher compression

[Paul B Mahol]

On 4/21/19, Michael Niedermayer <michael at niedermayer.cc> wrote:
> On Wed, Apr 10, 2019 at 01:45:51PM +0200, Paul B Mahol wrote:
>> Signed-off-by: Paul B Mahol <onemda at gmail.com>
>> ---
>>  libavcodec/agm.c   | 404 +++++++++++++++++++++++++++++++++++++++++++--
>>  libavformat/riff.c |   4 +
>>  2 files changed, 392 insertions(+), 16 deletions(-)
> [...]
>> @@ -509,6 +861,7 @@ static int decode_frame(AVCodecContext *avctx, void
>> *data,
>>      GetByteContext *gbyte = &s->gbyte;
>>      AVFrame *frame = data;
>>      int w, h, width, height, header;
>> +    unsigned compressed_size;
>>      int ret;
>>
>>      if (!avpkt->size)
>> @@ -524,13 +877,19 @@ static int decode_frame(AVCodecContext *avctx, void
>> *data,
>>      if (avpkt->size < s->bitstream_size + 8)
>>          return AVERROR_INVALIDDATA;
>>
>> -    s->key_frame = s->fflags & 0x1;
>> +    s->key_frame = avpkt->flags & AV_PKT_FLAG_KEY;
>>      frame->key_frame = s->key_frame;
>>      frame->pict_type = s->key_frame ? AV_PICTURE_TYPE_I :
>> AV_PICTURE_TYPE_P;
>>
>>      if (header) {
>> -        av_log(avctx, AV_LOG_ERROR, "header: %X\n", header);
>> -        return AVERROR_PATCHWELCOME;
>> +        if (avctx->codec_tag == MKTAG('A', 'G', 'M', '0') ||
>> +            avctx->codec_tag == MKTAG('A', 'G', 'M', '1'))
>> +            return AVERROR_PATCHWELCOME;
>> +        else
>
>> +            ret = decode_huffman2(avctx, header, (avpkt->size -
>> s->bitstream_size) - 8);
>
> where can i find samples for this ?
> i need to fix some bugs in this as it produces crashes but i have
> no samples to test to ensure a fix doesnt break anything

Just post patches, I will take care of rest.