* [FFmpeg-devel] [PATCH 1/5] avcodec/h264_mp4toannexb_bsf: refactor start_code_size handling
@ 2023-05-19 16:41 Zhao Zhili
2023-05-29 12:31 ` "zhilizhao(赵志立)"
2023-05-29 15:54 ` mypopy
0 siblings, 2 replies; 4+ messages in thread
From: Zhao Zhili @ 2023-05-19 16:41 UTC (permalink / raw)
To: ffmpeg-devel; +Cc: Zhao Zhili
From: Zhao Zhili <zhilizhao@tencent.com>
start_code_size depends on whether PS comes from out-of-band or
in-band. Make the code more readable.
---
libavcodec/h264_mp4toannexb_bsf.c | 34 ++++++++++++++++++++++++-------
1 file changed, 27 insertions(+), 7 deletions(-)
diff --git a/libavcodec/h264_mp4toannexb_bsf.c b/libavcodec/h264_mp4toannexb_bsf.c
index d11be455c2..7dce1ae9b6 100644
--- a/libavcodec/h264_mp4toannexb_bsf.c
+++ b/libavcodec/h264_mp4toannexb_bsf.c
@@ -43,10 +43,26 @@ typedef struct H264BSFContext {
int extradata_parsed;
} H264BSFContext;
+enum PsSource {
+ PS_OUT_OF_BAND = -1,
+ PS_NONE = 0,
+ PS_IN_BAND = 1,
+};
+
static void count_or_copy(uint8_t **out, uint64_t *out_size,
- const uint8_t *in, int in_size, int ps, int copy)
+ const uint8_t *in, int in_size, enum PsSource ps, int copy)
{
- uint8_t start_code_size = ps < 0 ? 0 : *out_size == 0 || ps ? 4 : 3;
+ uint8_t start_code_size;
+
+ if (ps == PS_OUT_OF_BAND)
+ /* start code already present in out-of-band ps data, so don't need to
+ * add it manually again
+ */
+ start_code_size = 0;
+ else if (ps == PS_IN_BAND || *out_size == 0)
+ start_code_size = 4;
+ else
+ start_code_size = 3;
if (copy) {
memcpy(*out + start_code_size, in, in_size);
@@ -202,6 +218,7 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
do {
uint32_t nal_size = 0;
+ enum PsSource ps;
/* possible overread ok due to padding */
for (int i = 0; i < s->length_size; i++)
@@ -230,7 +247,7 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
if (!s->sps_size) {
LOG_ONCE(ctx, AV_LOG_WARNING, "SPS not present in the stream, nor in AVCC, stream may be unreadable\n");
} else {
- count_or_copy(&out, &out_size, s->sps, s->sps_size, -1, j);
+ count_or_copy(&out, &out_size, s->sps, s->sps_size, PS_OUT_OF_BAND, j);
sps_seen = 1;
}
}
@@ -246,19 +263,22 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
if (new_idr && unit_type == H264_NAL_IDR_SLICE && !sps_seen && !pps_seen) {
if (ctx->par_out->extradata)
count_or_copy(&out, &out_size, ctx->par_out->extradata,
- ctx->par_out->extradata_size, -1, j);
+ ctx->par_out->extradata_size, PS_OUT_OF_BAND, j);
new_idr = 0;
/* if only SPS has been seen, also insert PPS */
} else if (new_idr && unit_type == H264_NAL_IDR_SLICE && sps_seen && !pps_seen) {
if (!s->pps_size) {
LOG_ONCE(ctx, AV_LOG_WARNING, "PPS not present in the stream, nor in AVCC, stream may be unreadable\n");
} else {
- count_or_copy(&out, &out_size, s->pps, s->pps_size, -1, j);
+ count_or_copy(&out, &out_size, s->pps, s->pps_size, PS_OUT_OF_BAND, j);
}
}
- count_or_copy(&out, &out_size, buf, nal_size,
- unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS, j);
+ if (unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS)
+ ps = PS_IN_BAND;
+ else
+ ps = PS_NONE;
+ count_or_copy(&out, &out_size, buf, nal_size, ps, j);
if (!new_idr && unit_type == H264_NAL_SLICE) {
new_idr = 1;
sps_seen = 0;
--
2.25.1
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [FFmpeg-devel] [PATCH 1/5] avcodec/h264_mp4toannexb_bsf: refactor start_code_size handling
2023-05-19 16:41 [FFmpeg-devel] [PATCH 1/5] avcodec/h264_mp4toannexb_bsf: refactor start_code_size handling Zhao Zhili
@ 2023-05-29 12:31 ` "zhilizhao(赵志立)"
2023-05-29 15:54 ` mypopy
1 sibling, 0 replies; 4+ messages in thread
From: "zhilizhao(赵志立)" @ 2023-05-29 12:31 UTC (permalink / raw)
To: FFmpeg development discussions and patches; +Cc: Andreas Rheinhardt
Ping for the patchset.
> On May 20, 2023, at 00:41, Zhao Zhili <quinkblack@foxmail.com> wrote:
>
> From: Zhao Zhili <zhilizhao@tencent.com>
>
> start_code_size depends on whether PS comes from out-of-band or
> in-band. Make the code more readable.
> ---
> libavcodec/h264_mp4toannexb_bsf.c | 34 ++++++++++++++++++++++++-------
> 1 file changed, 27 insertions(+), 7 deletions(-)
>
> diff --git a/libavcodec/h264_mp4toannexb_bsf.c b/libavcodec/h264_mp4toannexb_bsf.c
> index d11be455c2..7dce1ae9b6 100644
> --- a/libavcodec/h264_mp4toannexb_bsf.c
> +++ b/libavcodec/h264_mp4toannexb_bsf.c
> @@ -43,10 +43,26 @@ typedef struct H264BSFContext {
> int extradata_parsed;
> } H264BSFContext;
>
> +enum PsSource {
> + PS_OUT_OF_BAND = -1,
> + PS_NONE = 0,
> + PS_IN_BAND = 1,
> +};
> +
> static void count_or_copy(uint8_t **out, uint64_t *out_size,
> - const uint8_t *in, int in_size, int ps, int copy)
> + const uint8_t *in, int in_size, enum PsSource ps, int copy)
> {
> - uint8_t start_code_size = ps < 0 ? 0 : *out_size == 0 || ps ? 4 : 3;
> + uint8_t start_code_size;
> +
> + if (ps == PS_OUT_OF_BAND)
> + /* start code already present in out-of-band ps data, so don't need to
> + * add it manually again
> + */
> + start_code_size = 0;
> + else if (ps == PS_IN_BAND || *out_size == 0)
> + start_code_size = 4;
> + else
> + start_code_size = 3;
>
> if (copy) {
> memcpy(*out + start_code_size, in, in_size);
> @@ -202,6 +218,7 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
>
> do {
> uint32_t nal_size = 0;
> + enum PsSource ps;
>
> /* possible overread ok due to padding */
> for (int i = 0; i < s->length_size; i++)
> @@ -230,7 +247,7 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
> if (!s->sps_size) {
> LOG_ONCE(ctx, AV_LOG_WARNING, "SPS not present in the stream, nor in AVCC, stream may be unreadable\n");
> } else {
> - count_or_copy(&out, &out_size, s->sps, s->sps_size, -1, j);
> + count_or_copy(&out, &out_size, s->sps, s->sps_size, PS_OUT_OF_BAND, j);
> sps_seen = 1;
> }
> }
> @@ -246,19 +263,22 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
> if (new_idr && unit_type == H264_NAL_IDR_SLICE && !sps_seen && !pps_seen) {
> if (ctx->par_out->extradata)
> count_or_copy(&out, &out_size, ctx->par_out->extradata,
> - ctx->par_out->extradata_size, -1, j);
> + ctx->par_out->extradata_size, PS_OUT_OF_BAND, j);
> new_idr = 0;
> /* if only SPS has been seen, also insert PPS */
> } else if (new_idr && unit_type == H264_NAL_IDR_SLICE && sps_seen && !pps_seen) {
> if (!s->pps_size) {
> LOG_ONCE(ctx, AV_LOG_WARNING, "PPS not present in the stream, nor in AVCC, stream may be unreadable\n");
> } else {
> - count_or_copy(&out, &out_size, s->pps, s->pps_size, -1, j);
> + count_or_copy(&out, &out_size, s->pps, s->pps_size, PS_OUT_OF_BAND, j);
> }
> }
>
> - count_or_copy(&out, &out_size, buf, nal_size,
> - unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS, j);
> + if (unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS)
> + ps = PS_IN_BAND;
> + else
> + ps = PS_NONE;
> + count_or_copy(&out, &out_size, buf, nal_size, ps, j);
> if (!new_idr && unit_type == H264_NAL_SLICE) {
> new_idr = 1;
> sps_seen = 0;
> --
> 2.25.1
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [FFmpeg-devel] [PATCH 1/5] avcodec/h264_mp4toannexb_bsf: refactor start_code_size handling
2023-05-19 16:41 [FFmpeg-devel] [PATCH 1/5] avcodec/h264_mp4toannexb_bsf: refactor start_code_size handling Zhao Zhili
2023-05-29 12:31 ` "zhilizhao(赵志立)"
@ 2023-05-29 15:54 ` mypopy
2023-05-30 3:00 ` "zhilizhao(赵志立)"
1 sibling, 1 reply; 4+ messages in thread
From: mypopy @ 2023-05-29 15:54 UTC (permalink / raw)
To: FFmpeg development discussions and patches; +Cc: Zhao Zhili
On Fri, May 19, 2023 at 4:41 PM Zhao Zhili <quinkblack@foxmail.com> wrote:
>
> From: Zhao Zhili <zhilizhao@tencent.com>
>
> start_code_size depends on whether PS comes from out-of-band or
> in-band. Make the code more readable.
> ---
> libavcodec/h264_mp4toannexb_bsf.c | 34 ++++++++++++++++++++++++-------
> 1 file changed, 27 insertions(+), 7 deletions(-)
>
> diff --git a/libavcodec/h264_mp4toannexb_bsf.c b/libavcodec/h264_mp4toannexb_bsf.c
> index d11be455c2..7dce1ae9b6 100644
> --- a/libavcodec/h264_mp4toannexb_bsf.c
> +++ b/libavcodec/h264_mp4toannexb_bsf.c
> @@ -43,10 +43,26 @@ typedef struct H264BSFContext {
> int extradata_parsed;
> } H264BSFContext;
>
> +enum PsSource {
> + PS_OUT_OF_BAND = -1,
> + PS_NONE = 0,
> + PS_IN_BAND = 1,
> +};
> +
> static void count_or_copy(uint8_t **out, uint64_t *out_size,
> - const uint8_t *in, int in_size, int ps, int copy)
> + const uint8_t *in, int in_size, enum PsSource ps, int copy)
> {
> - uint8_t start_code_size = ps < 0 ? 0 : *out_size == 0 || ps ? 4 : 3;
> + uint8_t start_code_size;
> +
> + if (ps == PS_OUT_OF_BAND)
> + /* start code already present in out-of-band ps data, so don't need to
> + * add it manually again
> + */
> + start_code_size = 0;
> + else if (ps == PS_IN_BAND || *out_size == 0)
> + start_code_size = 4;
> + else
> + start_code_size = 3;
I prefer the original style, they are shorter and more concise
>
> if (copy) {
> memcpy(*out + start_code_size, in, in_size);
> @@ -202,6 +218,7 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
>
> do {
> uint32_t nal_size = 0;
> + enum PsSource ps;
>
> /* possible overread ok due to padding */
> for (int i = 0; i < s->length_size; i++)
> @@ -230,7 +247,7 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
> if (!s->sps_size) {
> LOG_ONCE(ctx, AV_LOG_WARNING, "SPS not present in the stream, nor in AVCC, stream may be unreadable\n");
> } else {
> - count_or_copy(&out, &out_size, s->sps, s->sps_size, -1, j);
> + count_or_copy(&out, &out_size, s->sps, s->sps_size, PS_OUT_OF_BAND, j);
> sps_seen = 1;
> }
> }
> @@ -246,19 +263,22 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
> if (new_idr && unit_type == H264_NAL_IDR_SLICE && !sps_seen && !pps_seen) {
> if (ctx->par_out->extradata)
> count_or_copy(&out, &out_size, ctx->par_out->extradata,
> - ctx->par_out->extradata_size, -1, j);
> + ctx->par_out->extradata_size, PS_OUT_OF_BAND, j);
> new_idr = 0;
> /* if only SPS has been seen, also insert PPS */
> } else if (new_idr && unit_type == H264_NAL_IDR_SLICE && sps_seen && !pps_seen) {
> if (!s->pps_size) {
> LOG_ONCE(ctx, AV_LOG_WARNING, "PPS not present in the stream, nor in AVCC, stream may be unreadable\n");
> } else {
> - count_or_copy(&out, &out_size, s->pps, s->pps_size, -1, j);
> + count_or_copy(&out, &out_size, s->pps, s->pps_size, PS_OUT_OF_BAND, j);
> }
> }
>
> - count_or_copy(&out, &out_size, buf, nal_size,
> - unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS, j);
> + if (unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS)
> + ps = PS_IN_BAND;
> + else
> + ps = PS_NONE;
> + count_or_copy(&out, &out_size, buf, nal_size, ps, j);
> if (!new_idr && unit_type == H264_NAL_SLICE) {
> new_idr = 1;
> sps_seen = 0;
> --
> 2.25.1
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
--
=======================================
Jun zhao/赵军
+++++++++++++++++++++++++++++++++++++++
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [FFmpeg-devel] [PATCH 1/5] avcodec/h264_mp4toannexb_bsf: refactor start_code_size handling
2023-05-29 15:54 ` mypopy
@ 2023-05-30 3:00 ` "zhilizhao(赵志立)"
0 siblings, 0 replies; 4+ messages in thread
From: "zhilizhao(赵志立)" @ 2023-05-30 3:00 UTC (permalink / raw)
To: FFmpeg development discussions and patches
> On May 29, 2023, at 23:54, mypopy@gmail.com wrote:
>
> On Fri, May 19, 2023 at 4:41 PM Zhao Zhili <quinkblack@foxmail.com> wrote:
>>
>> From: Zhao Zhili <zhilizhao@tencent.com>
>>
>> start_code_size depends on whether PS comes from out-of-band or
>> in-band. Make the code more readable.
>> ---
>> libavcodec/h264_mp4toannexb_bsf.c | 34 ++++++++++++++++++++++++-------
>> 1 file changed, 27 insertions(+), 7 deletions(-)
>>
>> diff --git a/libavcodec/h264_mp4toannexb_bsf.c b/libavcodec/h264_mp4toannexb_bsf.c
>> index d11be455c2..7dce1ae9b6 100644
>> --- a/libavcodec/h264_mp4toannexb_bsf.c
>> +++ b/libavcodec/h264_mp4toannexb_bsf.c
>> @@ -43,10 +43,26 @@ typedef struct H264BSFContext {
>> int extradata_parsed;
>> } H264BSFContext;
>>
>> +enum PsSource {
>> + PS_OUT_OF_BAND = -1,
>> + PS_NONE = 0,
>> + PS_IN_BAND = 1,
>> +};
>> +
>> static void count_or_copy(uint8_t **out, uint64_t *out_size,
>> - const uint8_t *in, int in_size, int ps, int copy)
>> + const uint8_t *in, int in_size, enum PsSource ps, int copy)
>> {
>> - uint8_t start_code_size = ps < 0 ? 0 : *out_size == 0 || ps ? 4 : 3;
>> + uint8_t start_code_size;
>> +
>> + if (ps == PS_OUT_OF_BAND)
>> + /* start code already present in out-of-band ps data, so don't need to
>> + * add it manually again
>> + */
>> + start_code_size = 0;
>> + else if (ps == PS_IN_BAND || *out_size == 0)
>> + start_code_size = 4;
>> + else
>> + start_code_size = 3;
> I prefer the original style, they are shorter and more concise
It takes a little time to figure out what two ternary do in a
single statement, it takes more time to figure out why, and
multiple ternaries is hard to write comments properly.
Multiple ternaries in a single statement works in simple cases.
For current situation, I prefer ‘if-else’.
>>
>> if (copy) {
>> memcpy(*out + start_code_size, in, in_size);
>> @@ -202,6 +218,7 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
>>
>> do {
>> uint32_t nal_size = 0;
>> + enum PsSource ps;
>>
>> /* possible overread ok due to padding */
>> for (int i = 0; i < s->length_size; i++)
>> @@ -230,7 +247,7 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
>> if (!s->sps_size) {
>> LOG_ONCE(ctx, AV_LOG_WARNING, "SPS not present in the stream, nor in AVCC, stream may be unreadable\n");
>> } else {
>> - count_or_copy(&out, &out_size, s->sps, s->sps_size, -1, j);
>> + count_or_copy(&out, &out_size, s->sps, s->sps_size, PS_OUT_OF_BAND, j);
>> sps_seen = 1;
>> }
>> }
>> @@ -246,19 +263,22 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
>> if (new_idr && unit_type == H264_NAL_IDR_SLICE && !sps_seen && !pps_seen) {
>> if (ctx->par_out->extradata)
>> count_or_copy(&out, &out_size, ctx->par_out->extradata,
>> - ctx->par_out->extradata_size, -1, j);
>> + ctx->par_out->extradata_size, PS_OUT_OF_BAND, j);
>> new_idr = 0;
>> /* if only SPS has been seen, also insert PPS */
>> } else if (new_idr && unit_type == H264_NAL_IDR_SLICE && sps_seen && !pps_seen) {
>> if (!s->pps_size) {
>> LOG_ONCE(ctx, AV_LOG_WARNING, "PPS not present in the stream, nor in AVCC, stream may be unreadable\n");
>> } else {
>> - count_or_copy(&out, &out_size, s->pps, s->pps_size, -1, j);
>> + count_or_copy(&out, &out_size, s->pps, s->pps_size, PS_OUT_OF_BAND, j);
>> }
>> }
>>
>> - count_or_copy(&out, &out_size, buf, nal_size,
>> - unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS, j);
>> + if (unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS)
>> + ps = PS_IN_BAND;
>> + else
>> + ps = PS_NONE;
>> + count_or_copy(&out, &out_size, buf, nal_size, ps, j);
>> if (!new_idr && unit_type == H264_NAL_SLICE) {
>> new_idr = 1;
>> sps_seen = 0;
>> --
>> 2.25.1
>>
>> _______________________________________________
>> ffmpeg-devel mailing list
>> ffmpeg-devel@ffmpeg.org
>> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>>
>> To unsubscribe, visit link above, or email
>> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>
>
>
> --
> =======================================
> Jun zhao/赵军
> +++++++++++++++++++++++++++++++++++++++
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-05-30 3:01 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-05-19 16:41 [FFmpeg-devel] [PATCH 1/5] avcodec/h264_mp4toannexb_bsf: refactor start_code_size handling Zhao Zhili
2023-05-29 12:31 ` "zhilizhao(赵志立)"
2023-05-29 15:54 ` mypopy
2023-05-30 3:00 ` "zhilizhao(赵志立)"
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