[FFmpeg-devel] [PATCH 1/2] avcodec/aac_adtstoasc: move the reference in the bsf internal buffer

[James Almer]

On 3/16/2018 8:16 PM, James Almer wrote:
> There's no need to allocate a new packet for it.
> 
> Signed-off-by: James Almer <jamrial at gmail.com>
> ---
>  libavcodec/aac_adtstoasc_bsf.c | 33 ++++++++++++++-------------------
>  1 file changed, 14 insertions(+), 19 deletions(-)
> 
> diff --git a/libavcodec/aac_adtstoasc_bsf.c b/libavcodec/aac_adtstoasc_bsf.c
> index 49f1f095e6..6541b1189c 100644
> --- a/libavcodec/aac_adtstoasc_bsf.c
> +++ b/libavcodec/aac_adtstoasc_bsf.c
> @@ -36,27 +36,26 @@ typedef struct AACBSFContext {
>   * This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
>   * ADTS header and removes the ADTS header.
>   */
> -static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *out)
> +static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *pkt)
>  {
>      AACBSFContext *ctx = bsfc->priv_data;
>  
>      GetBitContext gb;
>      PutBitContext pb;
>      AACADTSHeaderInfo hdr;
> -    AVPacket *in;
>      int ret;
>  
> -    ret = ff_bsf_get_packet(bsfc, &in);
> +    ret = ff_bsf_get_packet_ref(bsfc, pkt);
>      if (ret < 0)
>          return ret;
>  
> -    if (bsfc->par_in->extradata && in->size >= 2 && (AV_RB16(in->data) >> 4) != 0xfff)
> -        goto finish;
> +    if (bsfc->par_in->extradata && pkt->size >= 2 && (AV_RB16(pkt->data) >> 4) != 0xfff)
> +        return 0;
>  
> -    if (in->size < AV_AAC_ADTS_HEADER_SIZE)
> +    if (pkt->size < AV_AAC_ADTS_HEADER_SIZE)
>          goto packet_too_small;
>  
> -    init_get_bits(&gb, in->data, AV_AAC_ADTS_HEADER_SIZE * 8);
> +    init_get_bits(&gb, pkt->data, AV_AAC_ADTS_HEADER_SIZE * 8);
>  
>      if (ff_adts_header_parse(&gb, &hdr) < 0) {
>          av_log(bsfc, AV_LOG_ERROR, "Error parsing ADTS frame header!\n");
> @@ -71,10 +70,10 @@ static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *out)
>          goto fail;
>      }
>  
> -    in->size -= AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
> -    if (in->size <= 0)
> +    pkt->size -= AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
> +    if (pkt->size <= 0)
>          goto packet_too_small;
> -    in->data += AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
> +    pkt->data += AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
>  
>      if (!ctx->first_frame_done) {
>          int            pce_size = 0;
> @@ -82,7 +81,7 @@ static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *out)
>          uint8_t       *extradata;
>  
>          if (!hdr.chan_config) {
> -            init_get_bits(&gb, in->data, in->size * 8);
> +            init_get_bits(&gb, pkt->data, pkt->size * 8);
>              if (get_bits(&gb, 3) != 5) {
>                  avpriv_report_missing_feature(bsfc,
>                                                "PCE-based channel configuration "
> @@ -94,11 +93,11 @@ static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *out)
>              init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
>              pce_size = ff_copy_pce_data(&pb, &gb) / 8;
>              flush_put_bits(&pb);
> -            in->size -= get_bits_count(&gb)/8;
> -            in->data += get_bits_count(&gb)/8;
> +            pkt->size -= get_bits_count(&gb)/8;
> +            pkt->data += get_bits_count(&gb)/8;
>          }
>  
> -        extradata = av_packet_new_side_data(in, AV_PKT_DATA_NEW_EXTRADATA,
> +        extradata = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
>                                              2 + pce_size);
>          if (!extradata) {
>              ret = AVERROR(ENOMEM);
> @@ -120,17 +119,13 @@ static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *out)
>          ctx->first_frame_done = 1;
>      }
>  
> -finish:
> -    av_packet_move_ref(out, in);
> -    av_packet_free(&in);
> -
>      return 0;
>  
>  packet_too_small:
>      av_log(bsfc, AV_LOG_ERROR, "Input packet too small\n");
>      ret = AVERROR_INVALIDDATA;
>  fail:
> -    av_packet_free(&in);
> +    av_packet_unref(pkt);
>      return ret;
>  }
>  
> 

Will push later today.