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FFmpeg/libavfilter/af_join.c

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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Audio join filter
*
* Join multiple audio inputs as different channels in
* a single output
*/
#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "filters.h"
typedef struct ChannelMap {
int input; ///< input stream index
int in_channel_idx; ///< index of in_channel in the input stream data
enum AVChannel in_channel;
enum AVChannel out_channel;
} ChannelMap;
typedef struct JoinContext {
const AVClass *class;
int inputs;
char *map;
AVChannelLayout ch_layout;
int64_t eof_pts;
int eof;
ChannelMap *channels;
/**
* Temporary storage for input frames, until we get one on each input.
*/
AVFrame **input_frames;
/**
* Temporary storage for buffer references, for assembling the output frame.
*/
AVBufferRef **buffers;
} JoinContext;
#define OFFSET(x) offsetof(JoinContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM
#define F AV_OPT_FLAG_FILTERING_PARAM
static const AVOption join_options[] = {
{ "inputs", "Number of input streams.", OFFSET(inputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, A|F },
{ "channel_layout", "Channel layout of the "
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"output stream.", OFFSET(ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str = "stereo"}, 0, 0, A|F },
{ "map", "A comma-separated list of channels maps in the format "
"'input_stream.input_channel-output_channel.",
OFFSET(map), AV_OPT_TYPE_STRING, .flags = A|F },
{ NULL }
};
#define MAP_SEPARATOR '|'
AVFILTER_DEFINE_CLASS(join);
static int parse_maps(AVFilterContext *ctx)
{
JoinContext *s = ctx->priv;
char *cur = s->map;
while (cur && *cur) {
ChannelMap *map;
char *sep, *next, *p;
int input_idx, out_ch_idx;
next = strchr(cur, MAP_SEPARATOR);
if (next)
*next++ = 0;
/* split the map into input and output parts */
if (!(sep = strchr(cur, '-'))) {
av_log(ctx, AV_LOG_ERROR, "Missing separator '-' in channel "
"map '%s'\n", cur);
return AVERROR(EINVAL);
}
*sep++ = 0;
/* parse output channel */
out_ch_idx = av_channel_layout_index_from_string(&s->ch_layout, sep);
if (out_ch_idx < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid output channel: %s.\n", sep);
return AVERROR(EINVAL);
}
map = &s->channels[out_ch_idx];
if (map->input >= 0) {
av_log(ctx, AV_LOG_ERROR, "Multiple maps for output channel "
"'%s'.\n", sep);
return AVERROR(EINVAL);
}
/* parse input channel */
input_idx = strtol(cur, &cur, 0);
if (input_idx < 0 || input_idx >= s->inputs) {
av_log(ctx, AV_LOG_ERROR, "Invalid input stream index: %d.\n",
input_idx);
return AVERROR(EINVAL);
}
if (*cur)
cur++;
map->input = input_idx;
map->in_channel = AV_CHAN_NONE;
map->in_channel_idx = strtol(cur, &p, 0);
if (p == cur) {
/* channel specifier is not a number, handle as channel name */
map->in_channel = av_channel_from_string(cur);
if (map->in_channel < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid input channel: %s.\n", cur);
return AVERROR(EINVAL);
}
} else if (map->in_channel_idx < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid input channel index: %d\n", map->in_channel_idx);
return AVERROR(EINVAL);
}
cur = next;
}
return 0;
}
static av_cold int join_init(AVFilterContext *ctx)
{
JoinContext *s = ctx->priv;
int ret, i;
s->channels = av_calloc(s->ch_layout.nb_channels, sizeof(*s->channels));
s->buffers = av_calloc(s->ch_layout.nb_channels, sizeof(*s->buffers));
s->input_frames = av_calloc(s->inputs, sizeof(*s->input_frames));
if (!s->channels || !s->buffers|| !s->input_frames)
return AVERROR(ENOMEM);
for (i = 0; i < s->ch_layout.nb_channels; i++) {
s->channels[i].out_channel = av_channel_layout_channel_from_index(&s->ch_layout, i);
s->channels[i].input = -1;
s->channels[i].in_channel_idx = -1;
s->channels[i].in_channel = AV_CHAN_NONE;
}
if ((ret = parse_maps(ctx)) < 0)
return ret;
for (i = 0; i < s->inputs; i++) {
AVFilterPad pad = { 0 };
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pad.type = AVMEDIA_TYPE_AUDIO;
pad.name = av_asprintf("input%d", i);
if (!pad.name)
return AVERROR(ENOMEM);
if ((ret = ff_append_inpad_free_name(ctx, &pad)) < 0)
return ret;
}
return 0;
}
static av_cold void join_uninit(AVFilterContext *ctx)
{
JoinContext *s = ctx->priv;
int i;
for (i = 0; i < s->inputs && s->input_frames; i++) {
av_frame_free(&s->input_frames[i]);
}
av_freep(&s->channels);
av_freep(&s->buffers);
av_freep(&s->input_frames);
}
static int join_query_formats(AVFilterContext *ctx)
{
JoinContext *s = ctx->priv;
AVFilterChannelLayouts *layouts = NULL;
int i, ret;
if ((ret = ff_add_channel_layout(&layouts, &s->ch_layout)) < 0 ||
(ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
return ret;
for (i = 0; i < ctx->nb_inputs; i++) {
layouts = ff_all_channel_layouts();
if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0)
return ret;
}
if ((ret = ff_set_common_formats(ctx, ff_planar_sample_fmts())) < 0 ||
(ret = ff_set_common_all_samplerates(ctx)) < 0)
return ret;
return 0;
}
typedef struct ChannelList {
enum AVChannel *ch;
int nb_ch;
} ChannelList;
static enum AVChannel channel_list_pop(ChannelList *chl, int idx)
{
enum AVChannel ret = chl->ch[idx];
memmove(chl->ch + idx, chl->ch + idx + 1,
(chl->nb_ch - idx - 1) * sizeof(*chl->ch));
chl->nb_ch--;
return ret;
}
/*
* If ch is present in chl, remove it from the list and return it.
* Otherwise return AV_CHAN_NONE.
*/
static enum AVChannel channel_list_pop_ch(ChannelList *chl, enum AVChannel ch)
{
for (int i = 0; i < chl->nb_ch; i++)
if (chl->ch[i] == ch)
return channel_list_pop(chl, i);
return AV_CHAN_NONE;
}
static void guess_map_matching(AVFilterContext *ctx, ChannelMap *ch,
ChannelList *inputs)
{
int i;
for (i = 0; i < ctx->nb_inputs; i++) {
if (channel_list_pop_ch(&inputs[i], ch->out_channel) != AV_CHAN_NONE) {
ch->input = i;
ch->in_channel = ch->out_channel;
return;
}
}
}
static void guess_map_any(AVFilterContext *ctx, ChannelMap *ch,
ChannelList *inputs)
{
int i;
for (i = 0; i < ctx->nb_inputs; i++) {
if (inputs[i].nb_ch) {
ch->input = i;
ch->in_channel = channel_list_pop(&inputs[i], 0);
return;
}
}
}
static int join_config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
JoinContext *s = ctx->priv;
// unused channels from each input
ChannelList *inputs_unused;
char inbuf[64], outbuf[64];
int i, ret = 0;
/* initialize unused channel list for each input */
inputs_unused = av_calloc(ctx->nb_inputs, sizeof(*inputs_unused));
if (!inputs_unused)
return AVERROR(ENOMEM);
for (i = 0; i < ctx->nb_inputs; i++) {
AVFilterLink *inlink = ctx->inputs[i];
AVChannelLayout *chl = &inlink->ch_layout;
ChannelList *iu = &inputs_unused[i];
iu->nb_ch = chl->nb_channels;
iu->ch = av_malloc_array(iu->nb_ch, sizeof(*iu->ch));
if (!iu->ch) {
ret = AVERROR(ENOMEM);
goto fail;
}
for (int ch_idx = 0; ch_idx < iu->nb_ch; ch_idx++) {
iu->ch[ch_idx] = av_channel_layout_channel_from_index(chl, ch_idx);
if (iu->ch[ch_idx] < 0) {
/* no channel ordering information in this input,
* so don't auto-map from it */
iu->nb_ch = 0;
break;
}
}
}
/* process user-specified maps */
for (i = 0; i < s->ch_layout.nb_channels; i++) {
ChannelMap *ch = &s->channels[i];
AVFilterLink *inlink;
AVChannelLayout *ichl;
ChannelList *iu;
if (ch->input < 0)
continue;
inlink = ctx->inputs[ch->input];
ichl = &inlink->ch_layout;
iu = &inputs_unused[ch->input];
/* get the index for the channels defined by name */
if (ch->in_channel != AV_CHAN_NONE) {
ch->in_channel_idx = av_channel_layout_index_from_channel(ichl, ch->in_channel);
if (ch->in_channel_idx < 0) {
av_channel_name(inbuf, sizeof(inbuf), ch->in_channel);
av_log(ctx, AV_LOG_ERROR, "Requested channel %s is not present in "
"input stream #%d.\n", inbuf,
ch->input);
ret = AVERROR(EINVAL);
goto fail;
}
}
/* make sure channels specified by index actually exist */
if (ch->in_channel_idx >= ichl->nb_channels) {
av_log(ctx, AV_LOG_ERROR, "Requested channel with index %d is not "
"present in input stream #%d.\n", ch->in_channel_idx, ch->input);
ret = AVERROR(EINVAL);
goto fail;
}
channel_list_pop_ch(iu, av_channel_layout_channel_from_index(ichl, ch->in_channel_idx));
}
/* guess channel maps when not explicitly defined */
/* first try unused matching channels */
for (i = 0; i < s->ch_layout.nb_channels; i++) {
ChannelMap *ch = &s->channels[i];
if (ch->input < 0)
guess_map_matching(ctx, ch, inputs_unused);
}
/* if the above failed, try to find _any_ unused input channel */
for (i = 0; i < s->ch_layout.nb_channels; i++) {
ChannelMap *ch = &s->channels[i];
if (ch->input < 0)
guess_map_any(ctx, ch, inputs_unused);
if (ch->input < 0) {
av_channel_name(outbuf, sizeof(outbuf), ch->out_channel);
av_log(ctx, AV_LOG_ERROR, "Could not find input channel for "
"output channel '%s'.\n",
outbuf);
ret = AVERROR(EINVAL);
goto fail;
}
if (ch->in_channel != AV_CHAN_NONE) {
ch->in_channel_idx = av_channel_layout_index_from_channel(
&ctx->inputs[ch->input]->ch_layout, ch->in_channel);
}
av_assert0(ch->in_channel_idx >= 0);
}
/* print mappings */
av_log(ctx, AV_LOG_VERBOSE, "mappings: ");
for (i = 0; i < s->ch_layout.nb_channels; i++) {
ChannelMap *ch = &s->channels[i];
AVFilterLink *inlink = ctx->inputs[ch->input];
AVChannelLayout *ichl = &inlink->ch_layout;
enum AVChannel in_ch = av_channel_layout_channel_from_index(
ichl, ch->in_channel_idx);
av_channel_name(inbuf, sizeof(inbuf), in_ch);
av_channel_name(outbuf, sizeof(outbuf), ch->out_channel);
av_log(ctx, AV_LOG_VERBOSE, "%d.%s(%d) => %s(%d) ", ch->input,
inbuf, ch->in_channel_idx,
outbuf, i);
}
av_log(ctx, AV_LOG_VERBOSE, "\n");
for (i = 0; i < ctx->nb_inputs; i++) {
if (inputs_unused[i].nb_ch == ctx->inputs[i]->ch_layout.nb_channels)
av_log(ctx, AV_LOG_WARNING, "No channels are used from input "
"stream %d.\n", i);
}
fail:
for (i = 0; i < ctx->nb_inputs; i++)
av_freep(&inputs_unused[i].ch);
av_freep(&inputs_unused);
return ret;
}
static int try_push_frame(AVFilterContext *ctx)
{
AVFilterLink *outlink = ctx->outputs[0];
JoinContext *s = ctx->priv;
AVFrame *frame;
int linesize = INT_MAX;
int nb_samples = INT_MAX;
int nb_buffers = 0;
int i, j, ret;
for (i = 0; i < ctx->nb_inputs; i++) {
if (!s->input_frames[i]) {
nb_samples = 0;
break;
} else {
nb_samples = FFMIN(nb_samples, s->input_frames[i]->nb_samples);
}
}
if (!nb_samples)
goto eof;
/* setup the output frame */
frame = av_frame_alloc();
if (!frame)
return AVERROR(ENOMEM);
if (s->ch_layout.nb_channels > FF_ARRAY_ELEMS(frame->data)) {
frame->extended_data = av_calloc(s->ch_layout.nb_channels,
sizeof(*frame->extended_data));
if (!frame->extended_data) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
/* copy the data pointers */
for (i = 0; i < s->ch_layout.nb_channels; i++) {
ChannelMap *ch = &s->channels[i];
AVFrame *cur = s->input_frames[ch->input];
AVBufferRef *buf;
frame->extended_data[i] = cur->extended_data[ch->in_channel_idx];
linesize = FFMIN(linesize, cur->linesize[0]);
/* add the buffer where this plan is stored to the list if it's
* not already there */
buf = av_frame_get_plane_buffer(cur, ch->in_channel_idx);
if (!buf) {
ret = AVERROR(EINVAL);
goto fail;
}
for (j = 0; j < nb_buffers; j++)
if (s->buffers[j]->buffer == buf->buffer)
break;
if (j == i)
s->buffers[nb_buffers++] = buf;
}
/* create references to the buffers we copied to output */
if (nb_buffers > FF_ARRAY_ELEMS(frame->buf)) {
frame->nb_extended_buf = nb_buffers - FF_ARRAY_ELEMS(frame->buf);
frame->extended_buf = av_calloc(frame->nb_extended_buf,
sizeof(*frame->extended_buf));
if (!frame->extended_buf) {
frame->nb_extended_buf = 0;
ret = AVERROR(ENOMEM);
goto fail;
}
}
for (i = 0; i < FFMIN(FF_ARRAY_ELEMS(frame->buf), nb_buffers); i++) {
frame->buf[i] = av_buffer_ref(s->buffers[i]);
if (!frame->buf[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
for (i = 0; i < frame->nb_extended_buf; i++) {
frame->extended_buf[i] = av_buffer_ref(s->buffers[i +
FF_ARRAY_ELEMS(frame->buf)]);
if (!frame->extended_buf[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
frame->nb_samples = nb_samples;
frame->duration = av_rescale_q(frame->nb_samples,
av_make_q(1, outlink->sample_rate),
outlink->time_base);
if ((ret = av_channel_layout_copy(&frame->ch_layout, &outlink->ch_layout)) < 0)
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goto fail;
frame->sample_rate = outlink->sample_rate;
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frame->format = outlink->format;
frame->pts = s->input_frames[0]->pts;
frame->linesize[0] = linesize;
if (frame->data != frame->extended_data) {
memcpy(frame->data, frame->extended_data, sizeof(*frame->data) *
FFMIN(FF_ARRAY_ELEMS(frame->data), s->ch_layout.nb_channels));
}
s->eof_pts = frame->pts + av_rescale_q(frame->nb_samples,
av_make_q(1, outlink->sample_rate),
outlink->time_base);
ret = ff_filter_frame(outlink, frame);
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for (i = 0; i < ctx->nb_inputs; i++)
av_frame_free(&s->input_frames[i]);
return ret;
fail:
av_frame_free(&frame);
return ret;
eof:
for (i = 0; i < ctx->nb_inputs; i++) {
if (s->eof &&
ff_inlink_queued_samples(ctx->inputs[i]) <= 0 &&
!s->input_frames[i]) {
ff_outlink_set_status(outlink, AVERROR_EOF, s->eof_pts);
break;
}
}
return 0;
}
static int activate(AVFilterContext *ctx)
{
JoinContext *s = ctx->priv;
int i, ret, status;
int nb_samples = 0;
int64_t pts;
FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
if (!s->input_frames[0]) {
ret = ff_inlink_consume_frame(ctx->inputs[0], &s->input_frames[0]);
if (ret < 0) {
return ret;
} else if (ret == 0 && ff_inlink_acknowledge_status(ctx->inputs[0], &status, &pts)) {
s->eof |= status == AVERROR_EOF;
}
if (!s->eof && !s->input_frames[0] && ff_outlink_frame_wanted(ctx->outputs[0])) {
ff_inlink_request_frame(ctx->inputs[0]);
return 0;
}
}
if (s->input_frames[0])
nb_samples = s->input_frames[0]->nb_samples;
for (i = 1; i < ctx->nb_inputs && nb_samples > 0; i++) {
if (s->input_frames[i])
continue;
ret = ff_inlink_consume_samples(ctx->inputs[i], nb_samples, nb_samples, &s->input_frames[i]);
if (ret < 0) {
return ret;
} else if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
s->eof |= status == AVERROR_EOF;
}
if (!s->eof && !s->input_frames[i]) {
ff_inlink_request_frame(ctx->inputs[i]);
return 0;
}
}
return try_push_frame(ctx);
}
static const AVFilterPad avfilter_af_join_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = join_config_output,
},
};
const AVFilter ff_af_join = {
.name = "join",
.description = NULL_IF_CONFIG_SMALL("Join multiple audio streams into "
"multi-channel output."),
.priv_size = sizeof(JoinContext),
.priv_class = &join_class,
.init = join_init,
.uninit = join_uninit,
.activate = activate,
.inputs = NULL,
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FILTER_OUTPUTS(avfilter_af_join_outputs),
avfilter: Replace query_formats callback with union of list and callback If one looks at the many query_formats callbacks in existence, one will immediately recognize that there is one type of default callback for video and a slightly different default callback for audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);" for video with a filter-specific pix_fmts list. For audio, it is the same with a filter-specific sample_fmts list together with ff_set_common_all_samplerates() and ff_set_common_all_channel_counts(). This commit allows to remove the boilerplate query_formats callbacks by replacing said callback with a union consisting the old callback and pointers for pixel and sample format arrays. For the not uncommon case in which these lists only contain a single entry (besides the sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also added to the union to store them directly in the AVFilter, thereby avoiding a relocation. The state of said union will be contained in a new, dedicated AVFilter field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t in order to create a hole for this new field; this is no problem, as the maximum of all the nb_inputs is four; for nb_outputs it is only two). The state's default value coincides with the earlier default of query_formats being unset, namely that the filter accepts all formats (and also sample rates and channel counts/layouts for audio) provided that these properties agree coincide for all inputs and outputs. By using different union members for audio and video filters the type-unsafety of using the same functions for audio and video lists will furthermore be more confined to formats.c than before. When the new fields are used, they will also avoid allocations: Currently something nearly equivalent to ff_default_query_formats() is called after every successful call to a query_formats callback; yet in the common case that the newly allocated AVFilterFormats are not used at all (namely if there are no free links) these newly allocated AVFilterFormats are freed again without ever being used. Filters no longer using the callback will not exhibit this any more. Reviewed-by: Paul B Mahol <onemda@gmail.com> Reviewed-by: Nicolas George <george@nsup.org> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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FILTER_QUERY_FUNC(join_query_formats),
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};