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libxvid: Create extradata in init using a dummy frame

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Modifying global header extradata in encode_frame is an API violation
and only happens to work currently because mov writes its header
at the end of the file.

Heavily based off of a patch from 2012 by Nicolas George.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Derek Buitenhuis 2016-04-05 11:21:35 -04:00 committed by Luca Barbato
parent 785bfb1d7b
commit eae2ebded3
1 changed files with 41 additions and 0 deletions
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41
libavcodec/libxvid.c
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@ -85,6 +85,10 @@ struct xvid_ff_pass1 {
struct xvid_context *context; /**< Pointer to private context */
};
static int xvid_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *picture, int *got_packet);
/*
* Xvid 2-Pass Kludge Section
*
@ -677,6 +681,43 @@ FF_ENABLE_DEPRECATION_WARNINGS
if (avctx->max_b_frames > 0 && !x->quicktime_format)
xvid_enc_create.global |= XVID_GLOBAL_PACKED;
/* Encode a dummy frame to get the extradata immediately */
if (x->quicktime_format) {
AVFrame *picture;
AVPacket packet;
int got_packet, ret;
av_init_packet(&packet);
picture = av_frame_alloc();
if (!picture)
return AVERROR(ENOMEM);
xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
if (xerr) {
av_frame_free(&picture);
av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n");
return AVERROR_UNKNOWN;
}
x->encoder_handle = xvid_enc_create.handle;
picture->width = avctx->width;
picture->height = avctx->height;
picture->format = avctx->pix_fmt;
if ((ret = av_frame_get_buffer(picture, 32)) < 0) {
xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
av_frame_free(&picture);
return ret;
}
ret = xvid_encode_frame(avctx, &packet, picture, &got_packet);
if (!ret && got_packet)
av_packet_unref(&packet);
av_frame_free(&picture);
xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
}
/* Create encoder context */
xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
if (xerr) {