[FFmpeg-devel] [PATCH] aformat/movenc: add missing padding to output track extradata

[Thierry Foucu]

On Wed, Sep 25, 2019 at 10:30 AM James Almer <jamrial at gmail.com> wrote:

> Fixes ticket #8183.
>
> Signed-off-by: James Almer <jamrial at gmail.com>
> ---
>  libavformat/movenc.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/libavformat/movenc.c b/libavformat/movenc.c
> index c824ff5ba1..e3283871d0 100644
> --- a/libavformat/movenc.c
> +++ b/libavformat/movenc.c
> @@ -5377,12 +5377,13 @@ int ff_mov_write_packet(AVFormatContext *s,
> AVPacket *pkt)
>          !TAG_IS_AVCI(trk->tag) &&
>          (par->codec_id != AV_CODEC_ID_DNXHD)) {
>          trk->vos_len  = par->extradata_size;
> -        trk->vos_data = av_malloc(trk->vos_len);
> +        trk->vos_data = av_malloc(trk->vos_len +
> AV_INPUT_BUFFER_PADDING_SIZE);
>          if (!trk->vos_data) {
>              ret = AVERROR(ENOMEM);
>              goto err;
>          }
>          memcpy(trk->vos_data, par->extradata, trk->vos_len);
> +        memset(trk->vos_data + trk->vos_len, 0,
> AV_INPUT_BUFFER_PADDING_SIZE);
>      }
>
>      if (par->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
> @@ -5460,12 +5461,13 @@ int ff_mov_write_packet(AVFormatContext *s,
> AVPacket *pkt)
>           par->codec_id == AV_CODEC_ID_AC3) && !trk->vos_len) {
>          /* copy frame to create needed atoms */
>          trk->vos_len  = size;
> -        trk->vos_data = av_malloc(size);
> +        trk->vos_data = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
>          if (!trk->vos_data) {
>              ret = AVERROR(ENOMEM);
>              goto err;
>          }
>          memcpy(trk->vos_data, pkt->data, size);
> +        memset(trk->vos_data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
>      }
>
>      if (trk->entry >= trk->cluster_capacity) {
> @@ -6090,12 +6092,13 @@ static int
> mov_create_dvd_sub_decoder_specific_info(MOVTrack *track,
>          cur += strspn(cur, "\n\r");
>      }
>      if (have_palette) {
> -        track->vos_data = av_malloc(16*4);
> +        track->vos_data = av_malloc(16*4 + AV_INPUT_BUFFER_PADDING_SIZE);
>          if (!track->vos_data)
>              return AVERROR(ENOMEM);
>          for (i = 0; i < 16; i++) {
>              AV_WB32(track->vos_data + i * 4, palette[i]);
>          }
> +        memset(track->vos_data + 16*4, 0, AV_INPUT_BUFFER_PADDING_SIZE);
>          track->vos_len = 16 * 4;
>      }
>      st->codecpar->width = width;
> @@ -6453,11 +6456,12 @@ static int mov_write_header(AVFormatContext *s)
>                  mov_create_dvd_sub_decoder_specific_info(track, st);
>              else if (!TAG_IS_AVCI(track->tag) && st->codecpar->codec_id
> != AV_CODEC_ID_DNXHD) {
>                  track->vos_len  = st->codecpar->extradata_size;
> -                track->vos_data = av_malloc(track->vos_len);
> +                track->vos_data = av_malloc(track->vos_len +
> AV_INPUT_BUFFER_PADDING_SIZE);
>                  if (!track->vos_data) {
>                      return AVERROR(ENOMEM);
>                  }
>                  memcpy(track->vos_data, st->codecpar->extradata,
> track->vos_len);
> +                memset(track->vos_data + track->vos_len, 0,
> AV_INPUT_BUFFER_PADDING_SIZE);
>              }
>          }
>
> @@ -6713,10 +6717,11 @@ static int mov_write_trailer(AVFormatContext *s)
>              AVCodecParameters *par = track->par;
>
>              track->vos_len  = par->extradata_size;
> -            track->vos_data = av_malloc(track->vos_len);
> +            track->vos_data = av_malloc(track->vos_len +
> AV_INPUT_BUFFER_PADDING_SIZE);
>              if (!track->vos_data)
>                  return AVERROR(ENOMEM);
>              memcpy(track->vos_data, par->extradata, track->vos_len);
> +            memset(track->vos_data + track->vos_len, 0,
> AV_INPUT_BUFFER_PADDING_SIZE);
>          }
>          mov->need_rewrite_extradata = 0;
>      }
> --
> 2.22.0
>
>
I confirm that this patch fixes the issue i have here as well.


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