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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.

Original-by: Nicolas George <george@nsup.org>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Derek Buitenhuis 2016-04-03 12:55:25 -04:00
parent 040598218f
commit fdd7a594c3
1 changed files with 40 additions and 0 deletions
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40
libavcodec/libxvid.c
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@ -96,6 +96,9 @@ struct xvid_ff_pass1 {
};
static int xvid_encode_close(AVCodecContext *avctx);
static int xvid_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *picture, int *got_packet);
/*
* Xvid 2-Pass Kludge Section
@ -707,6 +710,43 @@ FF_ENABLE_DEPRECATION_WARNINGS
av_assert0(xvid_enc_create.num_plugins + (!!x->ssim) + (!!x->variance_aq) + (!!x->lumi_aq) <= FF_ARRAY_ELEMS(plugins));
/* Encode a dummy frame to get the extradata immediately */
if (x->quicktime_format) {
AVFrame *picture;
AVPacket packet;
int size, 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_EXTERNAL;
}
x->encoder_handle = xvid_enc_create.handle;
size = ((avctx->width + 1) & ~1) * ((avctx->height + 1) & ~1);
picture->data[0] = av_malloc(size + size / 2);
if (!picture->data[0]) {
av_frame_free(&picture);
return AVERROR(ENOMEM);
}
picture->data[1] = picture->data[0] + size;
picture->data[2] = picture->data[1] + size / 4;
memset(picture->data[0], 0, size);
memset(picture->data[1], 128, size / 2);
ret = xvid_encode_frame(avctx, &packet, picture, &got_packet);
if (!ret && got_packet)
av_packet_unref(&packet);
av_free(picture->data[0]);
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) {