[FFmpeg-devel] [PATCH 1/7] avcodec/wmv2dec: Parse extradata during init

[FFmpeg-devel] [PATCH 1/7] avcodec/wmv2dec: Parse extradata during init

[Andreas Rheinhardt]

And stop setting picture_number which was only done to not parse
extradata multiple times.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/wmv2dec.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/libavcodec/wmv2dec.c b/libavcodec/wmv2dec.c
index 469b2c4b2b..934bf56b1a 100644
--- a/libavcodec/wmv2dec.c
+++ b/libavcodec/wmv2dec.c
@@ -203,12 +203,8 @@ static int decode_ext_header(WMV2DecContext *w)
 
 int ff_wmv2_decode_picture_header(MpegEncContext *s)
 {
-    WMV2DecContext *const w = (WMV2DecContext *) s;
     int code;
 
-    if (s->picture_number == 0)
-        decode_ext_header(w);
-
     s->pict_type = get_bits1(&s->gb) + 1;
     if (s->pict_type == AV_PICTURE_TYPE_I) {
         code = get_bits(&s->gb, 7);
@@ -333,7 +329,6 @@ int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
     }
     s->esc3_level_length = 0;
     s->esc3_run_length   = 0;
-    s->picture_number++; // FIXME ?
 
     if (w->j_type) {
         ff_intrax8_decode_picture(&w->x8, &s->current_picture,
@@ -578,6 +573,8 @@ static av_cold int wmv2_decode_init(AVCodecContext *avctx)
 
     ff_wmv2_common_init(s);
 
+    decode_ext_header(w);
+
     return ff_intrax8_common_init(avctx, &w->x8,
                                   w->s.block, w->s.block_last_index,
                                   w->s.mb_width, w->s.mb_height);
-- 
2.34.1

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[FFmpeg-devel] [PATCH 2/7] avcodec/h261dec, vc1dec: Don't set write-only macroblock dimensions

[Andreas Rheinhardt]

They are generally set in ff_mpv_init_context_frame()
(mostly called by ff_mpv_common_init()); setting them
somewhere else should be avoided.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/h261dec.c | 6 ------
 libavcodec/vc1dec.c  | 3 ---
 2 files changed, 9 deletions(-)

diff --git a/libavcodec/h261dec.c b/libavcodec/h261dec.c
index 447e168c4f..a4e0bf9cf2 100644
--- a/libavcodec/h261dec.c
+++ b/libavcodec/h261dec.c
@@ -530,17 +530,11 @@ static int h261_decode_picture_header(H261DecContext *h)
     if (format == 0) { // QCIF
         s->width     = 176;
         s->height    = 144;
-        s->mb_width  = 11;
-        s->mb_height = 9;
     } else { // CIF
         s->width     = 352;
         s->height    = 288;
-        s->mb_width  = 22;
-        s->mb_height = 18;
     }
 
-    s->mb_num = s->mb_width * s->mb_height;
-
     skip_bits1(&s->gb); /* still image mode off */
     skip_bits1(&s->gb); /* Reserved */
 
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 534128d6ee..58a50f085d 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -741,9 +741,6 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
     if (v->matrix_coef == 1 || v->matrix_coef == 6 || v->matrix_coef == 7)
         avctx->colorspace = v->matrix_coef;
 
-    s->mb_width  = (avctx->coded_width  + 15) >> 4;
-    s->mb_height = (avctx->coded_height + 15) >> 4;
-
     if (v->profile == PROFILE_ADVANCED || v->res_fasttx) {
         ff_vc1_init_transposed_scantables(v);
     } else {
-- 
2.34.1

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Re: [FFmpeg-devel] [PATCH 2/7] avcodec/h261dec, vc1dec: Don't set write-only macroblock dimensions

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 775 bytes --]

On Sat, Oct 07, 2023 at 02:40:26AM +0200, Andreas Rheinhardt wrote:
> They are generally set in ff_mpv_init_context_frame()
> (mostly called by ff_mpv_common_init()); setting them
> somewhere else should be avoided.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  libavcodec/h261dec.c | 6 ------
>  libavcodec/vc1dec.c  | 3 ---
>  2 files changed, 9 deletions(-)

This seems to break several vc1 files like
vlcticket/5887/Cruise\ 2012_07_29_19_02_16.wmv

I think its there:
https://streams.videolan.org/issues/5887/

thx

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Re: [FFmpeg-devel] [PATCH 2/7] avcodec/h261dec, vc1dec: Don't set write-only macroblock dimensions

[Andreas Rheinhardt]

Michael Niedermayer:
> On Sat, Oct 07, 2023 at 02:40:26AM +0200, Andreas Rheinhardt wrote:
>> They are generally set in ff_mpv_init_context_frame()
>> (mostly called by ff_mpv_common_init()); setting them
>> somewhere else should be avoided.
>>
>> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
>> ---
>>  libavcodec/h261dec.c | 6 ------
>>  libavcodec/vc1dec.c  | 3 ---
>>  2 files changed, 9 deletions(-)
> 
> This seems to break several vc1 files like
> vlcticket/5887/Cruise\ 2012_07_29_19_02_16.wmv
> 
> I think its there:
> https://streams.videolan.org/issues/5887/
> 

Thanks for testing, much appreciated. The reason for this is line 968,
where mb_height is used before ff_mpv_common_init() is called. This
actually points to a potential bug: On frame size changes (can happen in
ff_vc1_decode_entry_point()), this line would still use the old value of
mb_height. But I don't want to deal with this at the moment, so I'll
simply drop the vc1dec.c stuff from this patch and apply only h261dec.c.

- Andreas

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[FFmpeg-devel] [PATCH 3/7] avcodec/h261dec: Don't set write-only picture_number

[Andreas Rheinhardt]

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/h261dec.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/libavcodec/h261dec.c b/libavcodec/h261dec.c
index a4e0bf9cf2..91d555a70e 100644
--- a/libavcodec/h261dec.c
+++ b/libavcodec/h261dec.c
@@ -512,10 +512,7 @@ static int h261_decode_picture_header(H261DecContext *h)
     }
 
     /* temporal reference */
-    i = get_bits(&s->gb, 5); /* picture timestamp */
-    if (i < (s->picture_number & 31))
-        i += 32;
-    s->picture_number = (s->picture_number & ~31) + i;
+    skip_bits(&s->gb, 5); /* picture timestamp */
 
     s->avctx->framerate = (AVRational) { 30000, 1001 };
 
-- 
2.34.1

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Re: [FFmpeg-devel] [PATCH 3/7] avcodec/h261dec: Don't set write-only picture_number

[Andreas Rheinhardt]

Andreas Rheinhardt:
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  libavcodec/h261dec.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/libavcodec/h261dec.c b/libavcodec/h261dec.c
> index a4e0bf9cf2..91d555a70e 100644
> --- a/libavcodec/h261dec.c
> +++ b/libavcodec/h261dec.c
> @@ -512,10 +512,7 @@ static int h261_decode_picture_header(H261DecContext *h)
>      }
>  
>      /* temporal reference */
> -    i = get_bits(&s->gb, 5); /* picture timestamp */
> -    if (i < (s->picture_number & 31))
> -        i += 32;
> -    s->picture_number = (s->picture_number & ~31) + i;
> +    skip_bits(&s->gb, 5); /* picture timestamp */
>  
>      s->avctx->framerate = (AVRational) { 30000, 1001 };
>  

Will apply patches #3, #7 and #8 of this patchset.

- Andreas

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[FFmpeg-devel] [PATCH 4/7] avcodec/h261dec: Remove pointless goto

[Andreas Rheinhardt]

There is no need to parse the header twice; doing so does nothing.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/h261dec.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/libavcodec/h261dec.c b/libavcodec/h261dec.c
index 91d555a70e..272bbbea34 100644
--- a/libavcodec/h261dec.c
+++ b/libavcodec/h261dec.c
@@ -605,7 +605,6 @@ static int h261_decode_frame(AVCodecContext *avctx, AVFrame *pict,
 
     h->gob_start_code_skipped = 0;
 
-retry:
     init_get_bits(&s->gb, buf, buf_size * 8);
 
     ret = h261_decode_picture_header(h);
@@ -627,8 +626,6 @@ retry:
         ret = ff_set_dimensions(avctx, s->width, s->height);
         if (ret < 0)
             return ret;
-
-        goto retry;
     }
 
     if ((avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B) ||
-- 
2.34.1

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Re: [FFmpeg-devel] [PATCH 4/7] avcodec/h261dec: Remove pointless goto

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 1250 bytes --]

On Sat, Oct 07, 2023 at 02:40:28AM +0200, Andreas Rheinhardt wrote:
> There is no need to parse the header twice; doing so does nothing.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  libavcodec/h261dec.c | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/libavcodec/h261dec.c b/libavcodec/h261dec.c
> index 91d555a70e..272bbbea34 100644
> --- a/libavcodec/h261dec.c
> +++ b/libavcodec/h261dec.c
> @@ -605,7 +605,6 @@ static int h261_decode_frame(AVCodecContext *avctx, AVFrame *pict,
>  
>      h->gob_start_code_skipped = 0;
>  
> -retry:
>      init_get_bits(&s->gb, buf, buf_size * 8);
>  
>      ret = h261_decode_picture_header(h);
> @@ -627,8 +626,6 @@ retry:
>          ret = ff_set_dimensions(avctx, s->width, s->height);
>          if (ret < 0)
>              return ret;
> -
> -        goto retry;

the goto is not pointless, it has a semicolon which includes a point

sorry i could not resist


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[FFmpeg-devel] [PATCH 5/7] fftools/ffmpeg_demux: Don't use fake object with av_opt_eval

[Andreas Rheinhardt]

The av_opt_eval family of functions emits errors messages on error
and can therefore not be used with fake objects when the AVClass
has a custom item_name callback. The AVClass for AVCodecContext
has such a custom callback (it searches whether an AVCodec is set
to use its name). In practice it means that whatever is directly
after the "cc" pointer to the AVClass for AVCodec in the stack frame
of ist_add() will be treated as a pointer to an AVCodec with
unpredictable consequences.

Fix this by using an actual AVCodecContext instead of a fake object.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 fftools/ffmpeg_demux.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/fftools/ffmpeg_demux.c b/fftools/ffmpeg_demux.c
index c71edf01a5..41fcb678c6 100644
--- a/fftools/ffmpeg_demux.c
+++ b/fftools/ffmpeg_demux.c
@@ -1042,9 +1042,6 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
     char *codec_tag = NULL;
     char *next;
     char *discard_str = NULL;
-    const AVClass *cc = avcodec_get_class();
-    const AVOption *discard_opt = av_opt_find(&cc, "skip_frame", NULL,
-                                              0, AV_OPT_SEARCH_FAKE_OBJ);
     int ret;
 
     ds  = demux_stream_alloc(d, st);
@@ -1176,18 +1173,20 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
         (o->data_disable && ist->st->codecpar->codec_type == AVMEDIA_TYPE_DATA))
             ist->user_set_discard = AVDISCARD_ALL;
 
+    ist->dec_ctx = avcodec_alloc_context3(ist->dec);
+    if (!ist->dec_ctx)
+        return AVERROR(ENOMEM);
+
     if (discard_str) {
-        ret = av_opt_eval_int(&cc, discard_opt, discard_str, &ist->user_set_discard);
+        const AVOption *discard_opt = av_opt_find(ist->dec_ctx, "skip_frame",
+                                                  NULL, 0, 0);
+        ret = av_opt_eval_int(ist->dec_ctx, discard_opt, discard_str, &ist->user_set_discard);
         if (ret  < 0) {
             av_log(ist, AV_LOG_ERROR, "Error parsing discard %s.\n", discard_str);
             return ret;
         }
     }
 
-    ist->dec_ctx = avcodec_alloc_context3(ist->dec);
-    if (!ist->dec_ctx)
-        return AVERROR(ENOMEM);
-
     ret = avcodec_parameters_to_context(ist->dec_ctx, par);
     if (ret < 0) {
         av_log(ist, AV_LOG_ERROR, "Error initializing the decoder context.\n");
-- 
2.34.1

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Re: [FFmpeg-devel] [PATCH 5/7] fftools/ffmpeg_demux: Don't use fake object with av_opt_eval

[Anton Khirnov]

Quoting Andreas Rheinhardt (2023-10-07 02:40:29)
> The av_opt_eval family of functions emits errors messages on error
> and can therefore not be used with fake objects when the AVClass
> has a custom item_name callback. The AVClass for AVCodecContext
> has such a custom callback (it searches whether an AVCodec is set
> to use its name). In practice it means that whatever is directly
> after the "cc" pointer to the AVClass for AVCodec in the stack frame
> of ist_add() will be treated as a pointer to an AVCodec with
> unpredictable consequences.
> 
> Fix this by using an actual AVCodecContext instead of a fake object.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  fftools/ffmpeg_demux.c | 15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)

Ok

-- 
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[FFmpeg-devel] [PATCH 6/7] fftools/ffmpeg_demux: Fix leak on error

[Andreas Rheinhardt]

An AVFormatContext leaks on errors that happen before it is attached
to its permanent place (an InputFile). Fix this by attaching
it earlier.

Given that it is not documented that avformat_close_input() is usable
with an AVFormatContext that has only been allocated with
avformat_alloc_context() and not opened with avformat_open_input(),
one error path before avformat_open_input() had to be treated
specially: It uses avformat_free_context().

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 fftools/ffmpeg_demux.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fftools/ffmpeg_demux.c b/fftools/ffmpeg_demux.c
index 41fcb678c6..350f233ab7 100644
--- a/fftools/ffmpeg_demux.c
+++ b/fftools/ffmpeg_demux.c
@@ -1462,8 +1462,10 @@ int ifile_open(const OptionsContext *o, const char *filename)
     if (data_codec_name)
         ret = err_merge(ret, find_codec(NULL, data_codec_name    , AVMEDIA_TYPE_DATA,     0,
                                         &ic->data_codec));
-    if (ret < 0)
+    if (ret < 0) {
+        avformat_free_context(ic);
         return ret;
+    }
 
     ic->video_codec_id     = video_codec_name    ? ic->video_codec->id    : AV_CODEC_ID_NONE;
     ic->audio_codec_id     = audio_codec_name    ? ic->audio_codec->id    : AV_CODEC_ID_NONE;
@@ -1488,6 +1490,7 @@ int ifile_open(const OptionsContext *o, const char *filename)
             av_log(d, AV_LOG_ERROR, "Did you mean file:%s?\n", filename);
         return err;
     }
+    f->ctx = ic;
 
     av_strlcat(d->log_name, "/",               sizeof(d->log_name));
     av_strlcat(d->log_name, ic->iformat->name, sizeof(d->log_name));
@@ -1527,10 +1530,8 @@ int ifile_open(const OptionsContext *o, const char *filename)
 
         if (ret < 0) {
             av_log(d, AV_LOG_FATAL, "could not find codec parameters\n");
-            if (ic->nb_streams == 0) {
-                avformat_close_input(&ic);
+            if (ic->nb_streams == 0)
                 return ret;
-            }
         }
     }
 
@@ -1582,7 +1583,6 @@ int ifile_open(const OptionsContext *o, const char *filename)
         }
     }
 
-    f->ctx        = ic;
     f->start_time = start_time;
     f->recording_time = recording_time;
     f->input_sync_ref = o->input_sync_ref;
-- 
2.34.1

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Re: [FFmpeg-devel] [PATCH 6/7] fftools/ffmpeg_demux: Fix leak on error

[Anton Khirnov]

Quoting Andreas Rheinhardt (2023-10-07 02:40:30)
> An AVFormatContext leaks on errors that happen before it is attached
> to its permanent place (an InputFile). Fix this by attaching
> it earlier.
> 
> Given that it is not documented that avformat_close_input() is usable
> with an AVFormatContext that has only been allocated with
> avformat_alloc_context() and not opened with avformat_open_input(),
> one error path before avformat_open_input() had to be treated
> specially: It uses avformat_free_context().
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  fftools/ffmpeg_demux.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)

Ok

-- 
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[FFmpeg-devel] [PATCH 7/7] avcodec/h261dec: Discard whole packet when discarding

[Andreas Rheinhardt]

(The return value doesn't really matter: For video decoders
every return value >= 0 is treated as "consumed all of the input".)

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/h261dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/h261dec.c b/libavcodec/h261dec.c
index 272bbbea34..8a823793e5 100644
--- a/libavcodec/h261dec.c
+++ b/libavcodec/h261dec.c
@@ -631,7 +631,7 @@ static int h261_decode_frame(AVCodecContext *avctx, AVFrame *pict,
     if ((avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B) ||
         (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I) ||
          avctx->skip_frame >= AVDISCARD_ALL)
-        return get_consumed_bytes(s, buf_size);
+        return buf_size;
 
     if (ff_mpv_frame_start(s, avctx) < 0)
         return -1;
-- 
2.34.1

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[FFmpeg-devel] [PATCH 8/8] avcodec/mpeg4video_parser: Don't set write-only current_picture_ptr

[Andreas Rheinhardt]

It is unused by ff_mpeg4_decode_picture_header() (unsurprisingly given
that when decoding this function is called before the context has been
initialized).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/mpeg4video_parser.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/libavcodec/mpeg4video_parser.c b/libavcodec/mpeg4video_parser.c
index 28353aa146..402594e01d 100644
--- a/libavcodec/mpeg4video_parser.c
+++ b/libavcodec/mpeg4video_parser.c
@@ -89,7 +89,6 @@ static int mpeg4_decode_header(AVCodecParserContext *s1, AVCodecContext *avctx,
     int ret;
 
     s->avctx               = avctx;
-    s->current_picture_ptr = &s->current_picture;
 
     if (avctx->extradata_size && pc->first_picture) {
         init_get_bits(gb, avctx->extradata, avctx->extradata_size * 8);
-- 
2.34.1

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Re: [FFmpeg-devel] [PATCH 1/7] avcodec/wmv2dec: Parse extradata during init

[Michael Niedermayer]

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On Sat, Oct 07, 2023 at 02:37:39AM +0200, Andreas Rheinhardt wrote:
> And stop setting picture_number which was only done to not parse
> extradata multiple times.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  libavcodec/wmv2dec.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)

should be ok

thx

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